Comment by Eduard

> If you look closely at the actual high profile cases where people got busted despite using tor, these people always made other mistakes that led authorities to them.

Assuming tor always was or became broken and is exploitable by law enforcement, authorities would try to maintain a false believe of tor's integrity so as to crack high profile cases for as long as possible.

Within this scenario, it is plausible to assume that authorities can decipher and discover information that can be used as the official pretextual charge / minor reason ("they made the mistake to use their public email address on the dark net forum") in order to not spill the beans on the actual means (here, tor being broken).