give someone enough rope and they'll hang themself

English

If one gives someone else enough freedom of action, they may destroy themself by foolish actions.

proverb

Italian: dare corda sufficiente per impiccarsi
Polish: nie można dawać komuś zbyt dużo swobody działania
Russian: заста́вь дурака́ бо́гу моли́ться, он и лоб расшибёт (zastávʹ duraká bógu molítʹsja, on i lob rasšibjót) (make a fool pray to the Lord, and he'll break his forehead), заста́вь дурака́ бо́гу моли́ться, он себе́ лоб расшибёт и други́м но́ги поотшиба́ет (zastávʹ duraká bógu molítʹsja, on sebé lob rasšibjót i drugím nógi pootšibájet) (make a fool pray to the Lord, he'll break his forehead and break other people's legs off)