Ad hominem simply means "to the man" (or woman). It's not necessarily an attack, and I didn't use that word. It's about character, not issue. I just can't get into psychoanalyzing people's motives. There's no better way to trip & fall over your own biases than to pretend to read others' motives.

Your statement on "comfirmatory bias": now there's something I can relate to!

Let's talk about it:

http://skepdic.com/confirmbias.html

Can't resist quoting from the source above:

This tendency to give more attention and weight to data that support our beliefs than we do to contrary data is especially pernicious when our beliefs are little more than prejudices. If our beliefs are firmly established upon solid evidence and valid confirmatory experiments, the tendency to give more attention and weight to data that fit with our beliefs should not lead us astray as a rule. Of course, if we become blinded to evidence truly refuting a favored hypothesis, we have crossed the line from reasonableness to closed-mindedness.

I wish we could get people like Mr Carroll to weigh in on peak oil.