JohnStuartMill wrote:I'm sorry, Ray, but I don't think you quite grasp the meaning of "ad hominem". You can't just look to its literal translation and call it a day.
Question: if a prosecutor impugned a witness's credibility by pointing out his actual bias in favor of the defendant, would that be an ad hominem fallacy?
Going back to your own link:
Example:
"You claim that this man is innocent, but you cannot be trusted since you are a criminal as well."
This argument would generally be accepted as reasonable, as regards personal evidence, on the premise that criminals are likely to lie to protect each other. On the other hand, it is a valid example of ad hominem if the source making the claim is doing so on the basis of evidence independent of its own credibility.
In general, ad hominem criticism of evidence cannot prove the negative of the proposition being claimed:
Example:
"Paula says the umpire made the correct call, but this can't be true, because Paula is a stupid idiot."
Assuming the premise is correct, Paula's evidence is valueless, but the umpire may nonetheless have made the right call.
Sometimes it's better to stick with simple definitions, as there are also subtypes of
ad hominem.
Another example:
Ad hominem abusive (also called argumentum ad personam) usually and most notoriously involves insulting or belittling one's opponent, but can also involve pointing out factual but ostensibly damning character flaws or actions which are irrelevant to the opponent's argument. This tactic is logically fallacious because insults and even true negative facts about the opponent's personal character have nothing to do with the logical merits of the opponent's arguments or assertions.
In other words, your questioning DCP and your deduction about the truth or falsity of the Mormon experience with the Holy Ghost says nothing about whether it's real, or valid, based on your questioning of DCP specifically. Wasn't your intention to question DCP, then apply his answers to the whole of "Mormon experience" and "revelatory experience" in general? That is, as I originally said, an "argument to the man", and then applying his answers to the whole of "revelatory experience". You can't establish whether it's true or not by drawing conclusions from one related experience.