I ended up really disliking Cole. By the end of the first disk I already thought that he was a judgmental boy scout prick. Then he cheats on his wife which makes him a hypocrite and a dick. He may be a talented detective, but how do you go to bed at night preaching one thing and practicing another?
As far as the WWII flashbacks, I got the impression that the reason Cole's unit fell behind was because he was an incompetent leader, but I don't get the impression that it was his fault the civilians died. Hogeboom seemed a bit overzealous, and unfortunately those kinds of things happen in wartime. The real issue seemed to be that the men where fed up of his crap by then, and instead of rallying them and helping them get over it together, everything just fell apart. I think they wounded him because they knew it would send him home, and they didn't want to be under his command anymore.