Because they've wholly bought into the idea that it's not "Americans" that are dying, it's "The Enemy" that is. That they wouldn't have died if they didn't do something to "deserve" it.

It's just like the Myth of Meritocracy. If you got it then you deserved it, the proof that you deserved it is that you got it.

Life is cheap to them, and they wholly subscribe to using violence and threats as a solution to most problems. No problem can’t be solved by: slapping, shooting, punching, beating the shit out of, running over, jailing, starving, or otherwise humiliating and ostracizing the offending party. Kids out of line? Tan ‘em. Prius in front of your truck driving too slow? Run ‘em over. Some lib mouthing off to ICE? Shoot ‘em.

I assume it’s lack of intelligence, laziness, and selfishness. The inability to understand nuance and complexity to work out alternative solutions, the unwillingness to expend the effort to understand anything other than their reductionist and myopic view, and the resistance to it costing them anything, monetarily, ego-wise, or having to change anything about their behavior.

So when some authority figure on “their team” uses one of the aforementioned methods to force compliance, they all cheer like it’s a football game. Their side scored a point, they were right, and they’ll punch anyone that tries to tell them different. The right’s propaganda machine has been running steadily and successfully at it’s current level since Reagan to demonize the left and since 9/11 immigrants and foreigners, so anyone not with them isn’t human anymore.