1. It's not clear what that expression actually means; how is the population of Gaza used as "human shields"?

2. Even if it was true, does that then justify murdering them? When there is hostage taking in, say, a supermarket the police tries their best to stop only the hostage taker(s) and not their victim(s); they certainly don't bomb the entire supermarket from the sky causing 500 casualties.

Many Western countries have had brutal acts of terrors committed against them, they didn't raze the entire neighborhoods were the perpetrators lived.

Could you please comment about other athrocities in the world in the last few years?

so they should just let themselves be killed?

Indeed. And it's so lucky for Israel that literally everyone they've killed so far just happened to be either Hamas, a supporter of Hamas or unfortunately a civilian being used as a human shield. What else can you do when the enemy uses human shields, but kill the human shields, everyone around them, their entire family and raze their entire neighborhood to the ground. There's no other way, really.

If anything we should be thanking Israel for being so level headed considering how many Palestinians are just getting thrown willy-nilly into the path of their bullets.

We're talking about Israel intentionally killing their own hostages, right?