2 factors
The Team:Yankees=absolutely not, Rays=hell no, generally any one in Contention with us (also in any post-season play)
The Score: if its 9-0 let the man have it he deserves it especially if its a perfect game.
having said that i want every hitter to do whatever he can to stop it, I feel it is a hollow victory if the last 5 batters roll over just to give someone the perfect game just like Favre giving Strahan the record breaking sack. If im a player I want to know that I downed every batter while that batter tried as best as they could to get onbase and yet i still came up on top, nothing should be given to you.