Right, which is why if you're not going to fight them (and they've been preparing to fight for at least two decades), you have to make them kill people that would hurt what they do care about, which is Islamic rule in the area.

They want the Islamic world (or Arab world) to rise up against Israel's atrocities and destroy Israel. They've said as much multiple times.

Them shooting Arab peacekeepers trying to demilitarize the region would be completely antithetical to that.

Of course, I don't think the Arab countries would want to put their citizens in harm's way. It's more of a thought experiment to illustrate that there are a variety of options available when most everyone (internationally) is committed to the same goal.