Human nature?

No. Nature is not justification for being a cunt. In fact that entire myth was a bastardisation (as I've mentioned previously) of what Dawkin's said (and later debunked) in The Selfish Gene.

As K pointed out months ago. Try using "It's human nature" in court. It will not cut it. You are responsible for your choices. Do not try to palm it off onto nature or justify it. If you are going to be a twat don't lie to yourself that you're doing anything other than being a twat.