allow him enough freedom and he will hurt himself or be caught If he's bad, give him enough rope and he'll hang himself. The police will stop him.
GIVE HIM ENOUGH ROPE AND HE'LL HANG HIMSELF
Meaning of GIVE HIM ENOUGH ROPE AND HE'LL HANG HIMSELF in English
English idioms vocab. Словарь английских идиом и выражений. 2012