Americans are just as callous toward (non-American) human life as Israel... and this is not just an American or Israeli thing. Humans can be astoundingly callous towards anyone seen as Other.

It isn't a bug, but a feature.

One of the hallmarks of higher civilization/culture is that we struggle against that natural tendency at times. But when push comes to shove, the Other gets shoved, with as much regret (usually) as a cat has for shoving something off the edge of the table to watch it fall.

We literally burned down Japan and Germany during WW2. The "conventional" firebombing raids killed more people than the atomic bombs. We killed a lot of French people in the lead up to the Normandy invasions and destroyed a lot of French property. We killed, directly or indirectly a LOT of people in Afghanistan and Iraq.

I do not point this out to say that we are evil because of that. However, it does show that we are human... and we often kinda, sorta feel bad about it afterwards (even if that doesn't actually change things or no real restitution is made).

There are a lot of things to be bummed out about in life. Unfortunately it is usually difficult to do anything about those things.