and Carol...I did not SAY Tuskegee was ad hominem. I tried to say that your example was ALSO a logical fallacy..."red herring" is not the technical term, but it makes the point.

Logical fallacy is a completely different thing than ad hominem (personal attack). You feel I made a logical fallacy (I have shown you that I did not), but that is an altogether different thing than calling me insane. And that's what I was referring to when I said "Ad hominem, Ebbie". And it was perfectly reasonable for me to do so. There's no place for personal attacks in any kind of discussion on any subject. Personal attacks are not a substitute for debate.