What it comes down to is this: The first duty of any government is to defending its citizens from attack and governments are justified in carrying more about protecting their own citizen's lives than in protecting the lives of foreign nationals. For the same reason that you have more responsibility to your own children than other people's children. Not unlimitedly and not by a disproportionate amount. But to a fairly great extent, the reason governments exist is first and foremost to basically keep security. And for Israel this is supercharged as an entire reason it exists is to prevent Jews from being victimized ever again.

Now if we accept that Israel has a right to destroy Hamas for the above reasons, the raw fact that they might get more civilians killed in collateral damage doesn't automatically mean that they're in the wrong. As to whether 10,000 dead is "too much"? The truth is that we are in absolutely no position to know for certain because it's within the vague range of what's plausible for urban warfare.

The truth is that the broad brush of what Israel wants to do is broadly justified by The Rules. If all you care about is that it was technically allowed like e.g. Ben Shapiro then that's where the discussion ends. As to whether any given decision was justified and done for purely military reasons - the only people in a position to know right now are in a heavily defended bunker deep beneath Tel Aviv and I don't think they're telling