give him enough rope and he'll hang himself

give him enough rope and he'll hang himself

If you give people the opportunity to do something wrong or detrimental to themselves, they will usually do it; one does not need to interfere to bring about someone's downfall. Don't interrupt him with questions. Just let him keep talking and he'll incriminate himself. Give him enough rope and he'll hang himself!
See also: and, enough, give, hang, himself, rope