"most populated" > "crammed" > "jailed" > "the new warsaw ghetto"
there must be a word that describes your question of why:
The word you're looking for also describes what's enabling the cognitive dissonance of putting Gaza in the same category as a Singapur, a Tokio or Hong Kong without blinking: Economic powerhouses that draw talent from developing and developed nations worldwide vs. a town with an economy that only consists of NGOs, the Hamas and UN-Organizations (The wage gap between ordinary gaza citizens and those working for the state is 50%).
But instead of owning that word, it's easier to just keep uttering "Israel is bombing one of the most densely populated places in the world".