Can you name another circumstance under which ad hominem is not fallacious?
As far as I'm aware, disputing an argument from authority is the only non-fallacious use of ad hominem. That's because an argument from authority is dependent on the character of the speaker, and attacking the speaker therefore can debunk the authority.
As far as I'm aware, disputing an argument from authority is the only non-fallacious use of ad hominem. That's because an argument from authority is dependent on the character of the speaker, and attacking the speaker therefore can debunk the authority.