[Galorme]

Also Beren's somewhat mercyless slaughter of the dwarfs wasn't exactly nice. But the main reason is that the elves and dwarfs are mostly different, but i think that in the elves the dwarves see the sillyness and happyness and beauty that they want to be, and the elves see the master craftmanship that they love. Also the elves see the extremes of heartless destruction of trees and nature that dislike, and the dwarves see the "bloody hippys" side of the elves. So its more their similarities and differences, rather than events, that breed hate between the races. But at the same time it can breed love (Gimili and Legolas anyone?).