I don't think most would've been comfortable with it - nor does it seem that Arsenal fans are: More of a slightly uncomfortable assent, I'd say. But assent, yes. Which is bad enough, you might say. But this is the nature of football fans: I'm fairly sure the more sane among our resident Chelsea fans would've detested John Terry if he played for another club.
If Suarez hadn't played for Liverpool and we had somehow ended up buying him, I think most of our fans would've been less than happy with the idea. But after a short enough while, if he had been a success on the pitch, I wouldn't be surprised if we had started seeing similar rationalizations to the ones we know - and love to mock - from RAWK: He's just doing whatever it takes to win, using racist language isn't the same as being a racist (and, come to think of it, wasn't his granddad black...?)
I'm sorry to say I wouldn't be surprised at all. That said, this place isn't always representative of the average United fan's mindset: I'm sure there would've been many posters here who would've unequivocally condemned such a transfer and refused to back down. It would've been an extremely awkward situation, though. Your team's star striker is a cnut of the highest order - what do you do? Hope he doesn't score too often? Or try to downplay his cuntishness? The second option is no doubt far easier than sticking to your principles, I'd say.