The people within that system have responsibility for how they behave, yes, but as long as the system continues to exist the behaviour will as well.
They are, as people, often immune from legal consequences for their actions.
Would they behave the same way otherwise?
https://reason.org/commentary/privatization-qualified-immuni...
Jails and prisons inflict violence daily on the inmates, and even the guards and staff, just from the very nature of the situation they create.
See: https://en.wikipedia.org/wiki/Structural_violence
The people within that system have responsibility for how they behave, yes, but as long as the system continues to exist the behaviour will as well.