You give too much credit. Many think of it as an acceptable cost of waging war, not something to waste regret on. Some few think of it as a positive (they chant death to America over there).
I've never heard anyone say it was a positive. While you're absolutely right that many would say that it was a casualty of war and that we have to expect some amount of mistakes to be made that does not mean there is not regret.
Many of my conservative acquaintances find the death of those kids to be regrettable in the way you come back to find your car over the line regret your parking job. Certainly they do not feel the tragedy nor any responsibility.
The some few i mentioned who see it as a positive are the ones who say nuke Iran, the only good Iranian is a dead Iranian etc. They might not come out and say I’m glad those schoolchildren are dead because they’ll know they’ll get pilloried. But make no mistake in what they believe.
I find this really hard to believe. People are sick of the Islamic Republic regime, not the person on the street. If anyone implies the two are the same thing then they're being intellectually lazy but I bet if you pressed you'd still find them capable of nuance. People do have some humanity even if little patience for a terror exporting regime
Fox News et al repeat that their populace chants death to America in the streets, as a means to justify the war to their viewership. It’s not a stretch to assume that a small number of consumers of that media would take that message to heart. Of course I don’t have to make such an assumption, I’ve met them.
Yes they routinely call for death to us but I'm just pointing out that I have very rarely heard us call for death to their people.. only to the regime. In fact I really illuminates the difference. the drfenders of the regime like the gloss over this fact. A lot of people in the wwst like to make this about domestic politics instead of justice and I suppose for those people they wouldn't say they're defending the regime they're just trying to score points. So be it there's going to be people who do that I get it.