Why do we feel hate?

This is a true question I have, I can't figure it out. This question ties into the last post. Why do we feel hate? I just don't understand, I mean I don't think any other living creatures feel the emotion hate in fact I don't think they have any emotions. I might be wrong, but that seems to be the case. Why do humans have emotions, why us? Why do we feel hate, and why do we act on our feelings, we say we have reason to hate someone but do we really? Do we have the right to judge someone, to say they are wrong. Why are we so different from everything else? WHY?
Think and if you have an opinion it will be much appreciated if it was given. 
 

Why be Superior?

Well why do we look at our selves as superior to everything else. Some of you may think you don't but you really do. We have pets, but do pets have us? NO. We do not look at it that way. We feed them and shelter them and give them medicine, we think because we take care of these animals they are ours. But no they are theirs and only theirs, not yours. They don't have your mine and your thoughts. We also think we are smarter than animals, but animals know everything they need to know on how to survive. Us, the humans know more than we need to already, and we apparently need to know how a dolphin communicates, but how does that effect our general survival. We need to know how to get food and water and shelter. So why do we know so much more than animals. You may say "Because we have the brain power", but animals have great brain power too, they aren't dumb. In a way animals are smarter, they don't waist things like we do don't kill for no reason like we do. So why are we superior to them? Why are we so different than everything else? Think and expand this idea, if you can. THINK ABOUT IT!

WORLD!!

Hello the rest of the world!
Why-rest of the world-do we blame our self for things that society states to be wrong, like tripping someone for example. Society states tripping someone is an act of meanness, but the only reason we trip someone is because society says it's wrong. Is it truly mean though? I know what your thinking,"Yes it is mean!"  But who told it was mean? Your teachers and parents and friends, society. Something to think about. I know this is almost nothing in detail, but I did this purposely, now you can think about.