Ad hominem, a Latin phrase meaning "against the person," is a rhetorical strategy that involves attacking the individual making an argument rather than engaging with the argument's substance. While often considered a logical fallacy, the term encompasses several distinct types, each with its own characteristics and implications for debate. These variations highlight the diverse ways in which personal attributes, circumstances, or past actions can
be used to deflect from the core issues at hand. Understanding these different forms of ad hominem is crucial for identifying flawed reasoning and promoting more constructive dialogue, especially since they are frequently encountered in everyday discussions, political debates, and even formal settings.
Fallacious ad hominem reasoning is categorized as an informal fallacy, specifically a genetic fallacy, which is a subcategory of fallacies of irrelevance. The overarching theme among these types is the diversion from the actual argument by focusing on the proponent's character. Instead of addressing the essence of someone's claim or attempting to refute it logically, the interlocutor attacks the person, implying that this personal attack is sufficient reason to dismiss the original argument. This tactic effectively sidesteps genuine debate and can create an environment where productive exchange is difficult. The key to discerning whether an argument constitutes an ad hominem fallacy lies in evaluating both the truthfulness of the accusation against the person and its relevance to the argument being presented.
Tu Quoque: The "You Also" Fallacy
One prominent type is *ad hominem tu quoque*, which literally translates to "you also." This fallacy occurs when an individual responds to an accusation or argument by pointing out that the accuser themselves possesses the same negative trait or has engaged in similar behavior. The structure often appears as: Person A makes a claim; Person B attacks Person A's character by asserting they have a negative property; Person A then defends themselves by attacking Person B, claiming they also possess the same property. A clear example provided by Professor George Wrisley illustrates this: a student asks a businessman giving a lecture if his company sells weapons to third-world rulers. The businessman retorts, "Is it true that your university gets funding by the same company that you are claiming is selling guns to those countries? You are not a white dove either." In this scenario, the student's initial accusation might be relevant to the businessman's narrative, but the businessman's *tu quoque* response, by attacking the student's perceived inconsistency, is irrelevant to the original point about his company's practices. The Canadian philosopher Christopher Tindale further explains that a *tu quoque* fallacy arises when an argument is dismissed based on the arguer's history. He emphasizes that even if the source is a hypocrite or has changed their mind, this does not logically diminish the credibility of the statement itself. For instance, a patient dismissing a doctor's advice to lose weight because the doctor is also overweight is an example of this fallacy; the doctor's personal weight does not invalidate the medical advice.
Circumstantial and Guilt by Association
Another form is the circumstantial ad hominem, which highlights that someone's circumstances—such as their job, wealth, property, or relationships—dispose them to take a particular position. This constitutes an attack on the potential bias of a source. Like other ad hominem types, circumstantial ad hominem can be fallacious or non-fallacious. It is fallacious when a person's disposition to make a certain argument is used to invalidate the argument itself, overlapping with the genetic fallacy (dismissing a claim due to its source). For example, a daughter might dismiss her father's warning about smoking because he himself smokes or used to smoke. Her father's inconsistency does not alter the fact that smoking causes various diseases. However, it can be a sound argument if the premises are correct and the bias is directly relevant to the argument. Douglas N. Walton, a philosopher specializing in informal fallacies, suggests that a circumstantial ad hominem can be non-fallacious when the personality of the person making the argument is relevant to the argument itself, such as when they speak as an authority figure. He uses the example of a witness in a trial: if the witness has a history of lying and cheating, a jury might legitimately question their trustworthiness.
Guilt by association is another type of ad hominem fallacy, occurring when an arguer is attacked due to their alleged connection with a discredited person or group. This form attacks a source because of perceived similarities between the views of the arguer and other proponents of the argument. The pattern is: Individual S makes claim C; Individual S is associated with Group G, which has an unfavorable reputation; therefore, Individual S and their views are questionable. Academic Leigh Kolb provides an example from the 2008 U.S. vice-presidential campaign, where Sarah Palin attacked Barack Obama for having worked with Bill Ayers, a former leader of the Weather Underground. Despite Obama denouncing terrorism, his opponents used this association to link him to it. Guilt by association is common in social and political debates, often surfacing after major events like scandals or acts of terrorism, leading to attacks against groups perceived to be linked to such events, as seen with attacks against Muslims in the U.S. after September 11.
Abusive Ad Hominem and Political Applications
The abusive ad hominem argument, also known as direct ad hominem, involves a direct attack on the character of the person presenting an argument. This type of argument is typically fallacious and often counterproductive, as it makes a proper dialogue difficult to achieve. The key issues in determining if it's a fallacy are whether the accusation against the person is true and whether it is relevant to the argument. For instance, in a courtroom, if an attorney cross-examines an eyewitness and reveals a past conviction for lying, concluding that the witness is therefore lying in the current testimony would be fallacious. However, arguing that the witness should not be trusted due to their past record is not necessarily a fallacy, as it pertains to their credibility. Beyond these traditional categories, author Eithan Orkibi, studying Israeli politics, identified two additional forms common during election periods: the "precedent ad hominem" and the "behavioral ad hominem." The former argues that a person's past mistakes disqualify them from current office, while the latter claims that past indecency in arguments implies present indecency. Both rely on collective memory and exploit the audience's potential inability to objectively assess the truth, shifting focus from policy to character.
