They are roleplaying as criminals. It’s fine to offer a bounty on them as more said roleplay, but don’t treat this as a broken aspect of the game or CCP failing to do their job - this is an intended and allowed playstyle. EVE has been actively marketed as a world where players can be the ‘bad guys’ and ‘break the (in-character) law’.
I suggest checking out the The Great 2020 CODE Hunt ( 4B+ in Bounties Paid-out so far!) thread to see how another player has gone about successfully placing bounties on CODE. for some ideas on how to manage your own offer and limit risk of being scammed out of your funds by collaborators.