The Stanford Prison Experiment is a good analogue to what we are seeing with ICE. People empowered to be cruel.
And they are given the message (from the president!) they have absolute immunity, and instructed to regard the law as a set of nonbinding guidelines.
The Supreme Court played a role in this too. They made it harder to stop by halting the long-established precedent of nationwide injunctions.
The people pulling the trigger are still not blameless. They are murderers no matter how badly misled. Your common murderer is misguided too. That doesn't mean they are absolved. I don't think that's what you were saying, but it bears mentioning.