My heart aches for the countless victims of this band of fascists in the executive branch.
I think they are simply poorly trained people that are given free reign. The results are disastrous. They probably don't wake up thinking "Today I'm going to murder someone" but they just don't realize what they're doing. I'm not sure how it's at the destructiveness scale at this moment, but these organizations can and it probably will get much worse as their internal culture morphs into more directly aggressive stance.
The shootings were incredibly dumb, and it's pretty much what one would expect when they create this kind of situation. Listening to the "Revolutions" podcast I realized situations like these are incredibly common all along history, you have armed people with tense spirits, a gun goes off and tragedy ensues. The most terrible part of all of this is the reaction of the authorities that lie, gaslight and support these people, get them off the hook and this reaction will only generate more violence and more deaths as ICE realizes they _really can_ act with impunity.
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.