I didn't answer the poll question because all of them strike me as merely being statements, presumably of facts. I think of
ad hominem as a form of fallacious argumentation, and none of the poll options are arguments.
- Ad hominem arguments:
- You were wrong about XYZ; therefore you're wrong about ABC.
- He lied about ABC. He's probably lying about this too.
- I think abortion is morally wrong. Of course you do, you're a Catholic.
- My opponent suggests that lowering taxes will be a good idea -- this is coming from a woman who eats a pint of Ben and Jerry’s each night!
- Trump has lied left and right to curry favor with voters. So have Cruz and Clinton. -- This is a special kind of ad hominem argument called tu quoque. It is invalid because the retort does nothing to establish or refute the truth of the initial claim.
- Tom Cruise's movies suck. He's a Scientologist. -- A special kind of ad hominem called "poisoning the well"
- Not ad hominem arguments:
- You were wrong about XYZ. -- This is just a statement (like everything in the poll) that has no argument.
- Any other isolated statement of fact or supposed fact.
- Any non rhetorical question.
- Ad hominem, but valid too:
- My opponent suggests that lowering taxes on Ben and Jerry's ice cream will be a good idea -- this is coming from a woman who eats a pint of Ben and Jerry’s each night! -- This version of the argument above is ad hominem; however, it's also a valid ad hominem response because the fact that she eats so much B&J ice cream is indicative of the possible existence of a conflict of interest and thus legitimate (valid/not fallacious) to note.
Do you agree with the definition of ad hominem as presented in this OP?
I agree with the definition at the link you provided. I didn't read the whole OP. I read only the content at the link you shared, so if there's some other or amplifying definition in the OP itself, I haven't seen it.
Do you agree that ad hominem is used to undermine the person instead of the argument he/she is making and/or to derail the discussion?
Yes, mostly. "Mostly" because of two things:
- except for whether ad hominem line or argument is used to derail a discussion, and
- although ad hominem attacks are usually fallacious, they can be legitimate when a character critique is directly or indirectly related to the point being articulated.
Derailment:
I can't say that a or every user of the fallacy explicitly intends to derail the conversation. It may well be they truly believe they are making a valid point. (Believing something never makes it factually so -- notwithstanding the saying "perception is reality" -- as Plato's "Allegory of the Cave" in
The Republic makes clear.) I'm sure, however, some users of the fallacy do intend to derail discussions by doing so. Whether or not the
ad hominem argument does derail the discussion depends on the audience and other participant(s) to the conversation. If they allow it to derail the discussion, well, it is thus derailed. LOL
Valid
ad hominem:
An ad hominem is valid when the claims made about a person’s character or actions are relevant to the conclusions being drawn. Consider, for example, former New York governor Eliot Spitzer, who was caught on a wiretap arranging to hire a prostitute for $4,300. Because this behavior ran counter to Spitzer’s anticorruption platform, its unveiling would prevent Spitzer from governing successfully; thus, criticizing this aspect of his character was relevant and fair. In an earlier scandal, in 1987, televangelist Jimmy Swaggart was seen at a motel with a prostitute. Because his behavior undercut his preaching and status as a Christian role model, a character attack based on this incident would have been spot-on.
In another case, when President Bill Clinton fibbed on national television about his affair with White House intern Monica Lewinsky, accusations that he was a liar were not entirely unjust. Although a supporter might argue that Clinton’s sex life was not directly relevant to his ability to govern, his ability to adhere to the truth could certainly be, and his willingness to lie on this occasion could call into question the veracity of his remarks on other subjects.
Of course, one should not discount everything any person says, no matter how badly he or she has been discredited. The fact that a person lies or behaves improperly on one occasion does not mean that he or she lies or behaves inappropriately all the time. Again, a critique of a person’s character should not prevent further examination of the arguments at hand. After all, which position is right is usually independent of a person’s character or conduct.
The keys re: ad hominem arguments' validity or lack thereof are found in the answers to the questions below:
- How relevant is a political candidate’s character or action to his or her ability to perform in office?
- How pertinent is any person’s past or group affiliation to the claims that person makes or to that individual’s expertise in a specific domain?
If the character-based attacks are not relevant to these larger issues, then they are best ignored.
Do you think most members understand the difference between ad hominem and personal insults?
I have no idea. I don't interact with most members. I have seen both insults and
ad hominem arguments on USMB.