@talisay999 Damn, I got preempted.
For everyone else: "Yakuza" does not indicate a singular organization. Most Japanese mafia members don't do the really shady shit and stick to the loan sharking/protection racketeering/big business blackmailing type of deals, but a minority of them still amounts to mind-blowing quantities of heroin and meth smuggled and humans trafficked (especially because Nippon has shit for natural resources so there's a ton of import/export). You can't justify that shit by banning outright theft and donating to charity, and it's not like the "good" yakuza are going to not have an increased amount of rapes and murders in it, and even if you have a genuinely benevolent and honorable gangster, he's going to have led a pretty fucked up life to have landed in that position, turned a blind eye to many ongoing greater evils, and ultimately chose to remain in that type of underworld, doubly so if he still has all of his fingers.
What, you thought that the stuff you see under the drug and mind break tags are based purely on male fantasy? Think again, motherfucker. Civilization is kept aloft by a carnival of horrors that can be readily seen if you peel two or more layers of the thin veneer we've built up for ourselves, made all the more easier in modern times by people who find out the grisly details and post their findings somewhere googleable.
...It is also correct, however, that this is media, which means shit's going to get stylized, idealized, or something elseized and the viewer will be expected to go along with it (or simply drop the work if they find their disbelief to be unsuspendable). Each work is its own universe and functions on its own different rules, especially with manga. I'd expect manga readers to be familiar with that process, but oh well.