When you see a NBA player make a game changing mistake, do you hold a grudge against that player?
It's easy to get frustrated when someone loses the ball at the end of the game, or plays bad defense. But if that was the case, I wouldn't be the biggest Pierce fan in the world. He's lost some games for us at the end, but I'd still go with home over 99% of the league. These guys are pros and they have short memorys, just like fans 'should,' but me included, sometimes doesn't.
For example, I remeber I got very mad when Rondo took a floater in transitition at the end of the game when Pierce and Ray were open and both were hitting shots. I forget what game this was, mabye Bobcats or Wizards toward the end of the year. I was actually mad for a couple of days about that. (Plus the status of the team was very down at that point anyways.)
But Westbrook took a bad shot last game, and I highly doubt OKC fans are 'mad' at him, they were just mad at the decision he made at the game.
No grudges for me.