If they are poorly trained, or if their training does not account for being harassed by suicidal morons, and they are trying to enforce the law and arrest perps, things get out of control and people die.
On MTP this morning Todd Blanche explained that all over the US ICE does their job with no interference from radicals. Only in MN do the pols rile up the crazies to interfere with ICE and end up dead. Why is that? Do the democrats want to keep the Somali fraud cash cow flowing? Do the dems think that illegals will add more democrat votes?
ICE does not kill citizens they don't like, ICE kills in self-defense because crazy radicals interfere with them doing their job, as directed by local politicians. If pols cooperated with ICE like in American cities and states no one would have died. ICE would get criminals from the local jails instead of chasing them around the city.