You're accountable for your actions. You control you, not them.
And admit that your opponent did you enough harm to anger you? Why?
I know it's very tempting but I'm always glad when I have someone to talk me out of it cause there could be consequences. Unless something falls onto your lap and you know you won't get caught.. then go for it.
Well... I excel in most of the unhealthiest of things. I wouldn't want go lose another three decades for being successful...
This question has no answer. You should always take revenge.