I don’t doubt that many organized criminals would be good at making money under a new system where drugs were legal. I just works better for everyone when the best way for them to deal with their problems is to call the police instead of to line people up and kill them with a hammer one by one.
At some point what you are left with is some rich guys who run powerful organizations who would absolutely kill you if it made economic sense for them to do so but who don’t actually kill anyone any more. You can call them organized criminals if you like, but the ongoing misery they are creating has been lessened (and would be lessened further if we didn’t make laws to prop up the rich at the expense of the poor).