Why can't we just get along?

That's what I'm saying!
I don't see why we can't all just get along. I mean, we're all made out of the same stuff. If you took out money, clothes and religion out of the situation, then we're basically all the same people.
That is, if you count out the fact that we all have different opinions and beliefs.
The thing is, it's unrealistic to think that we would all be the same, but I think that if we all accepted each other's beliefs, we would all get along swimmingly.