Land of the Dead, Today

[AChimp]

I saw it last night. It sucked, especially the ending. The theatre was pretty packed, and everyone started laughing when one guy said, "Let's go to Canada! There's no people there!" Then they all took their zombie-squashing gun truck and went north, leaving all those people on foot to fend for themselves.

I never saw the first movie, so maybe someone can fill me in. Why wasn't there a concentrated effort to exterminate the zombies? I mean, everyone rides into that little town shoots a few zombies and then rides away. Why not go on a killing spree? Or use fire?