I always thought that the point of the series was that Jessie Custer IS
an asshole. He doesn't really care about helping anybody except his friends. The whole point of him getting the voice of God is not that he uses it to go around helping people; he wants to use it to kick God's ass. Anyone who gets in his way is just cannon fodder. That's what I always liked about the books; he's a very flawed human. There's been many situations in the book where he could have used his power for good but decided it just wasn't worth the effort. Unfortunately, that's a very human trait and (in my opinion) makes him a refreshing character. He's definitely no Spiderman or Captain America.