Set a thief to catch a thief.
This is an interesting proverb. It may have a meaning of 以毒攻毒 “Fight poison with poison”.
To fight against computer virus, the government hires some hackers to set a thief to catch a thief.
By the way, I just thought of another proverb.
以其人之道，還治其人之身 “Fight fire with fire”.
Sometimes you have to fight fire with fire when combating evils. This tactic has been used a lot in the world of spies.
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