This is the military being used on foreign invaders, or the people that materially support them. Just because they aren't uniformed soldiers doesn't mean they don't pose an existential threat to the United States.

I'm not saying that this couldn't be a step on the road to "drone strikes against US citizens on US soil", but it doesn't inevitably lead to that (though I'd say we're already on that slope, this is an attempt to push the oulder back up the hill, not shove it further down.)