I'm going to answer your question in a few minutes, but in the meantime. let me ask you a side question...
Was my post at #169 clear enough? I'm trying to keep the focus of this thread out of the typical Creationist/Evolutionist rut.
Absolutely clear to me, as have been your other replies. I am guilty of not reading all of the replies here with intense scrutiny, but I think poster garbanzo missed your point. I am thankful we are avoiding much of the typical rut.
BTW, most cases of "spontaneous" mutagencity are lethal.