I would sure hope so. If I look at myself (since that's where I have context) I'd say yes. I think a lot of the shittiness in people's personalities stems from trying to meet their needs (some of them unreasonable) and competing with everyone else to get them. That's a very me versus you mentality which leads to aggression and forms bad personality traits.
I'd like to say that everyone begins to understand wants versus needs after a few decades, and settles down into a pattern of contentment rather than resentment.