Also remember when Nick says, "If the world's only gonna see a fox as shifty and untrustworthy, then there is no point in trying to be anyone else."

By this he probably meant that Nick did neither anything better nor worse than being a con artist.

This is why his character alignment is "Chaotic Neutral (not Evil).

I wouldn't really think of Nick as a psychotic skinner after this

The skunk was never murdered actually. The director states that the fur was naturally shed, so no murder.