Watcher's File#1

Why is it that people dislike? I've seen many conflicts start and get bigger just because of petty differences...Why does that happen?

Why also do such small things destroy bonds strengthened for a long time? For example, the best of friends becme the worst of enemies just because of said difference...And when they are enemies, they're other friends become hostile to the other person...Why,why do these things happen?

More observation is required...Maybe then I can get the answers I need and want...