It's easy to be angry. It's not hard to get upset when you see people being mean, cruel and thoughtless. It is way too simple to find fault with someone else or someone else's idea, especially when you were not inclined to think that way in the first place. Heck, it's also pretty common to get a bit jealous when someone else either beats you to the punch with an idea you like or they actually get that project you tried years ago (and failed) to work.