Earlier quoted context omitted.
Because Gaza is, for all intents and purposes, a city-state, like Singapore or Hong Kong. It’s not really one part of a larger nation, so it doesn’t make sense to compare it to places that are. It’s also being blockaded by its neighbors, so there is no freedom of movement in or out. If rockets are fired at Bnei Brak, the residents there can flee to the rest of Israel. If rockets are fired at Gaza, the residents have…
> If rockets are fired at Bnei Brak, the residents there can flee to the rest of Israel. When rockets rain down on their homes, citizens of Bnei Brak can flee from their homes in car or on foot, go ??? somewhere (where exactly?) and hope they’re not blown to bits along the way. Wow, those privileged Israelis. The very lap of luxury.
I'm not sure why you're responding so aggressively; you asked why Gaza is singled out as densely populated, and that's the answer.