Say you're right, and there is no difference between going to jail in 2024 and being enslaved on a plantation in 1824 (what "slavery" means to people in the U.S.). Simply saying that does not work.

Our comrades must understand that ideological remolding involves long-term, patient and painstaking work, and they must not attempt to change people's ideology, which has been shaped over decades of life, by giving a few lectures or by holding a few meetings. Persuasion, not compulsion, is the only way to convince them. Compulsion will never result in convincing them. To try to convince them by force simply won't work. This kind of method is permissible in dealing with the enemy, but absolutely impermissible in dealing with comrades or friends.

Here, we aren't even trying "a few lectures or meetings" and then giving up on people, we're shouting a hot take at them and then telling them to fuck off (or worse) if they don't immediately abandon their long-held beliefs. What is the point of reading all this leftist theory if we just ignore it?

But yes, I think there are some significant differences between modern incarceration and the U.S. conception of slavery (antebellum south chattel slavery). That doesn't mean prison conditions are fine, or that it's OK to coerce prisoners into virtually unpaid labor, or anything like that.