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.
I'm really skeptical of that. As others have said, you can quit being a cop but you can't really opt out of a deployment early under normal circumstances. People also have a constant stream of evidence about what it means to be an American cop and sign up anyway. There is evidence for troops, but less of it, especially on video.
idk, a lot of people seem to have the (inadequate) idea that being part of a rigid hierarchy in the military will give structure to their lives because they can't handle, to put it simply, the existential nausea of needing to make choices for themselves. I don't think they get into it to be industrial serial killers, even if many of them become that.
Being a cop is different. You aren't going to get blown up by an RPG, and other things like IEDs and suicide bombs and even snipers are vanishingly rare. You're mostly dealing with small arms, if even that, and you've got a vest and/or a shield if those threats appear often.
I think most prospective soldiers have some level of understanding that, because they are potentially engaging with an enemy militia, they might just get blown to smithereens without warning. Cops will pretty much never encounter something like that, just petty criminals that they get to beat, manhandle, and shoot.