I think nadal fans--on the average-- are fairly reasonable.
its the Federer fans that go overboard. they feel threatened by nadal.
I will be honest with you: I have only seen death and injury threats from some of the Federer fans at places like MTF.
I think people go to MTF just to blast nadal with all their blind hate for him.
I lost pretty much all of my Federer oriented friends the minute nadal captured the u.s. open.
nadal winning 2 slams in 2013 is the worst thing that could have possibly happened to some of these guys.
Wasn't there an incident just this year in Shanghai where a fan (not sure who's fan he was) threatened to kill Federer when an online argument (must be on a forum) got out of control? He later apologized. So I believe there are crazy fans overall who say stuff without giving it much thought - mostly on the spur of the moment. There's only one incident out there where a crazy Steffi fan became too vindictive at one point and stabbed Monica. So the chances of all these threats becoming actual events are to the minimum.