P.R.
The notices are pathetic. First, they sometimes tell people to leave an area, and then the IDF attacks the people as they are leaving, and then the IDF levels the places where the civilians fled. So some % of the "notice" is actually just a trap.
But more importantly, the notices are useless. As you said, 15K people per sq mile (that's an exaggeration but whatever). Where are you going to go on half an hour's notice? There are few roads because they've been bombed. There's no gas because blockade. There are people wounded from previous attacks. What the fuck is someone supposed to do when they are told they have half an hour. Go into the basement and hope the rubble doesn't collapse on you is what they can do.
Your incessant JCDing of a genocide -- which, at this point, it unambiguously is -- just fuck it there are no words.