What was Mark's opinion of Mike?

Mark thought Mike was foolish, but he also understands the way Mike feels.

Like that damn fool, Mike, he feels like he had it coming, feels guilty for something somebody else did. Man, that is sickl How do you think I felt, finding you lying there in the yard? I knew it was the Shepards. If they had killed you it woulda been my fault. That is eating me up, Bryon, and you won't even let me get even for you."