Considering the behavior of ICE, it seems like they hired some folks just desperate to find legal cover to shoot someone. There are numerous videos of them casually drawing their weapons on protesters.
I feel like this is a problem that is going to be inherent to any position of power that allows people to use weapons; you very heavily selection-bias towards people want power and to use weapons, especially if the people who do abuse their position of violence are consistently allowed to do it with impunity.
Not saying that every person in law enforcement is bad, obviously; there are plenty of cops and people in the military [1] that are responsible with their weapons and do genuinely want to help people, but if you create an institution where people don't have to pay the consequences for their actions, then of course you're going to attract people who want to commit those actions.
The Catholic Church with their abusive priests is one of the most obvious examples. They create a situation where an adult male can be surrounded by kids unsupervised, not be married, and when abuse does happen it is covered up and the priest is moved somewhere else. Combined with the fact that they're paid shit, there's going to be a very strong selection bias of pedophiles.
My dad has a story from the late fifty's. He was at a party at his cousins house in Stockton. And the cousins brother in law had just been hired as a country sheriff and was boasting about how he was looking forward to killing his first nagger.
https://www.reddit.com/r/ICE_Raids/comments/1q7u4kz/ice_agen...
https://www.reddit.com/r/minnesota/comments/1q7y43s/cbp_poin...