Israel is the occupying power of Gaza according to international law.
This means Jews have an obligation and a duty to protect civilians under their illegal occupation:
Five Israeli Talking Points on Gaza—Debunked
"It (Israel) cannot simultaneously occupy the territory, thus usurping the self-governing powers that would otherwise belong to Palestinians, and declare war upon them.
"These contradictory policies (occupying a land and then declaring war on it) make the Palestinian population doubly vulnerable."
Islamic terrorist talking point debunked:
It (Islamic terrorists) cannot attack a sovereign state and expect that there will be no consequences.