You are correct, but guessing other teams with "cancerous players" don't always fare so well either. Also, those teams that happen to be successful, could they have been more successful had they cut the cancer? As someone who has been on many teams in my life, whether sports or otherwise, if you have too much negativity and not enough team players, it does effect everyone eventually.
Plug your ears Buggy.....I am sure towards the end of his time in Green Bay, Favre was considered a negative in the locker room, but what he did on the field warranted keeping him around for awhile. So its a delicate balance of does the good out weight the bad? Same type of decision they had to make about Montgomery, Randall and Josh Sitton. All that said, there are obviously more factors that weigh into the final decision of getting rid of a players like these, but negative attitudes I am sure are not just completely overlooked. Again, we only hear and see some of it, guessing the coaches and other players know when enough is enough.