The US/Israel are far and away the number one terrorist organization in the world, and it's not even close.
Thats not the point though. There is no reason for either party to respond proportionally in a war. Going to war against an equal weight class as idiocy, sun tzu figured that one out forever ago.
israel has killed even more "untold innocent children and innocents", so you should expect to continue finding no global sympathy or solidarity for them as they, an aggressor, initiate a war of choice against someone else.
By your logic, israel has greater causus belli against themselves than iran. Yet we don't see israel warring against itself. The only conclusion is that israel doesn't actually care about kids being killed, and started this war for totally different reasons.