People upvoted this guy because they agreed with his fundamental points despite the baiting, and in turn he received positive feedback. I think maybe you underestimate the effect karma has on posting behavior; it's not just about pushing comments up and down the page.
This doesn't matter. Doesn't work on reddit, doesn't work on StackOverflow, and won't work anywhere else.
http://www.reddit.com/wiki/reddiquette
I also found this discussion, which says that in practice there will always be a middle ground between moderating based on quality and moderating based on opinion:
http://www.reddit.com/r/TheoryOfReddit/comments/1g14yo/is_th...
because our ego bias is to moderate based on opinion. However that's why a guideline to moderate based on quality pulls things towards the middle.