Well... I mean I know an idiot ISTP. He does things logically, and impersonally -- makes decisions based on logic rather than emotions, but he still does things poorly because he's not very smart, and therefore can't use/construct logic very well.
I know a ISTP like this too, it is part of why I started the thread. I was actually hoping someone who knew far more than I do would come and speak on this issue.
The sad thing is, if this ISTP had a better grasp on his Feeling side and smoothed the way with others more often, his assinine decisions could be more easily overlooked, especially by the feelers in his life and he could make his way so much easier, but he's been doubly scorned, doesn't like to use feeling to make decisions regarding others and yet too unintelligent to make wise decisions on his own, he's left out to dry alone...again and again by life through his own bad decisions. Yet he is the first person to say "No sympathy or special treatment for others" and yet he begs for it himself when his own bad decision making skills let him down which he attributes to "statistical bad luck" and then he's puzzled when he burns other people out.