For me, bitcoin users are the source for all of it because it was clear that the purpose of bitcoin and other altcoins was created to help us attained our financial freedom to help us move our money and raised it freely without having intervention from government and other related parties. But many users are fully capable of such as developing coins to tricked or scammed somebody, doing illegal business in bitcoin because the mere fact it is decentralized makes hard for authorities to traced or tracked them.