There is no number of foreigners that is unacceptable to sacrifice for a middle class livelihood. Anti-cop because they can imagine a scenario where a cop inconveniences them. These principles don't apply to the Waffen SS because they can't imagine a soldier personally inconveniencing them and, of course, foreigners aren't really humans.
should also be considered that a lot of american 'volunteers' arent true volunteers, they join the military because theyre in the middle of nowhere with zero education and want a way out and its a purely economic decision. most dont expect to have to terrorize children. one guy i know just sat in a car near the border playing on a gameboy seeing if there were any cartel drones flying around. said he detected a single one in his entire career