When children get killed by accident, for example in irresponsible crossfire, that's a tragedy. When they are intentionally targetted by the killer, that's an obscenity.
I can't see how it makes any difference whatsoever whether that child is a Jew, a Muslim, a Catholic or a Protestant. It's another life destroyed, and the person who pulled the trigger knows what they did, and will have to live with it, whichever side they are on, whatever uniform they wear or don't wear.
Double standards, and the politics of the last atrocity -those are the building blocks of a wall of hate that someday has to be dismantled, bit by bit.