The first one, what’s the question?

I’m sure any sane person would answer no civilians casualties are acceptable. Which one of many reasons why Hamas must be eradicated, co-locating to intentionally cause the death of civilians. It’s why what Hamas is doing by co-locating is one of the worst war crimes.

As for reluctance, I think it’s about everyone knows that nobody except Hamas wants civilian casualties. Look even here on worldnews how successful they’ve been with that propaganda.

And that doesn’t even mention the regular attacks by Iraq, Houthis, Syrians, etc on US troops and civilian shipping lanes.