An important movement to watch. Prison serves many purposes (punishment, temporary removal to keep communities safer), but one of them should be reform: it's our moral duty (and it costs less in the end).
Instead, in numerous ways, prison life is unnecessarily degrading and petty; the for-profit vendor supply chain is rife with cronyism, abusing a literally-captive population. If we're trying to rehabilitate those who can be reformed, then we're failing, and these people are taking extreme measures to draw attention to their abuse.