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).
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.