As Israel continues to drop leaflets, send warnings, and delay attacks to give "civilians" a chance to get to a safe zone. In quotes, because I truly wonder just how many of them are "innocent civilians". While I'm sure many have no choice, it also seems many "civilians" happily work as Hamas shields.
The Gaza strip is composed of a population with which even the surrounding countries, who are culturally similar, want nothing to do with.
When a populace supports the violent actions of its government, the populace is every bit a fair target in warfare.
This goes equally for Gaza in this conflict, German cities in WWII, and the US today.
This is a lesson that democracies struggle to learn, though. The US didn't apply it in A-stan or Iraq. Looks like Israel understands it, but is air dropping leaflets as diplomatic cover (no one in Gaza has anywhere to flee). I guarantee that the muslims grok, which is why they prefer to attack soft civilian targets rather than military ones.