[javajosh]

Sometimes participants in a discussion can't get a particular scenario out of their head to the point they literally can't accept even a hypothetical scenario that differs.

You seem stuck on the scenario where, by construction, an actually guilty person is accused, and then claims the allegations are false.

But you haven't really engaged, it seems to me, with another scenario where, by construction, an actually innocent person is falsely accused, and then claims the allegations are false. Is your position that this just never happens, and never could happen? Or it happens so infrequently it can be ignored?