Why are some people wired to look for any minor reason to dismiss others and disobey God?

Update: Nobody owes me a thing. But God gave them life and allows them to continue in it, no matter how they are. When they know him or claim to, then they show it by remembering others (not me) and doing whatever they are meant to.
Update 2: Of course, I have personally struggled with it myself. I wanted to hear what others say about it, and find it interesting that a topic that was first in Religion & Spirituality (I thought correctly) ended up in Sociology :) where less people are answering.
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