What is a good proverb in response to "two wrongs don't make a right"?

Two wrongs don't make right, but three lefts do.

To provide the reference for Peter Shor's comment, now removed:

fight fire with fire

to fight against an opponent by using the same methods or weapons that the opponent uses

[Merriam Webster Dictionary]

evil prospers when good men do nothing

This saying appears in various forms. Here's one

Edmund Burke, one of the foremost political speakers of 18th century England, said: "All that is necessary for the triumph of evil is that good men do nothing."

https://www.crossrhythms.co.uk/articles/life/Evil_Prospers_When_Good_Men_Do_Nothing/37074/p1/

To be politically correct I suppose some would change it to, "evil prospers when good people do nothing"

Leviticus 24:19–21 has:

“eye for an eye; tooth for a tooth”

which may be ‘appropriate’ to the poster’s purpose in some circumstances, although civilized societies are supposed to have outgrown this attitude.

(Not strictly a proverb, but biblical quotations have that kind of status. )