As with Barton, I wouldn't have wanted him in the first place, but once he's a Newcastle player you just kind of have to be resigned to the fact. You support them when they play, you like them when they do something wonderful, and you just hope they don't do anything shitty while in your colours. When they inevitably do then you have to condemn it and hope they can turn over a new leaf (again).
With Suarez it seems pretty obvious to me that he's not going to change. If it had been two biting incidents and a racism charge while a Newcastle player I'd have certainly wanted him sold. Just the racism charge alone would have been enough for me to stop supporting him.
The racism charge seemed to get him nothing but backing from the club and a lot of its supporters, the amount of racial abuse Evra got from them via Twitter etc was vile.