Would you ever pursue revenge?

Say you’re whole families slaughtered in front of you by some people in government and you find out a long time friend of yours was in on it and you were supposed to be killed to but survived and when they find out you’re alive they try to kill you too. Or even something like a serial killer kills you’re whole family in front of you but you get away. If given the chance would you take or even pursue revenge? I always ask myself what I’d do in those situations I see it a lot in Tv shows. Realistically I’d probably leave to law enforcement but I also know I’m the type to sometimes hold grudges and what’s more dangerous then a man with nothing to lose?
Would you ever pursue revenge?
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