I have heard that many shippers have send death threats to writers and authors, hoping to scare them enough into making their pairing "canon".
Honestly if that is true, then those people are completely insane and don't have a life at all. If you really get that mad just because 2 fictional characters (who are not real at all) didn't get together, then there is something wrong with you. People shouldn't take fiction that seriously!
In my honest opinion, getting that obsessed over a fictional pairing is pretty pathetic.