I'm not sure if this is intentional or not, but the current arc is a great critique for Japan's system of society exclusion (and by extension, most prison systems in the world).
How do you expect a criminal to fair better in the future if you take them out of the society? Like, what do you think they will do next? Take their worse treatment lying down oooor try their luck doing a criminal activity again because, sure it's risky, but it gets you the actual profits? No surprise most of them pick option no.2.
Especially so when you have cases like Tsuyoshi's where he just got caught up in a bunch of other people's bullshit.