give someone enough time and freedom to do what they want and they will make a mistake or get into trouble and be caught Don`t worry about trying to control him. If you give him enough rope he will hang himself.
GIVE SOMEONE ENOUGH ROPE AND THEY WILL HANG THEMSELF
Meaning of GIVE SOMEONE ENOUGH ROPE AND THEY WILL HANG THEMSELF in English
English idioms vocab. Словарь английских идиом и выражений. 2012