The only conditions would be to protect my own life or that of an innocent person.
Otherwise, I find it a weakness. What is the point in hurting somebody else? Having satisfaction out of that is showing insecurity about one's power. Showing restraint and letting everyone be, on the other hand, is giving out the message that you're so secure of your ground that you do not need to hurt anyone. Revenge? What's the point! You become just as bad as what you condemned.
Even if many people would without laws, it would be my personal satisfaction to hold myself to higher standards and ethical principles. Actually, I would try to stop people from killing themselves and try to gain power to put laws in place to protect people. I absolutely abhor any cruelty, evil or malice. Real strength is continuing to do good to others even if they have harmed you and it shows exceptional character.