The cricial thing to note about the last war on Gaza was that it was claimed to be justified on the grounds that it was going to put an end to missile attacks. The 1400 dead, mostly unarmed civilians, and a very high proportion of them children were a price worth paying to stop the missiles.

And it did not achieve that - and the fact that missile launching commenced once more is seen as justification for another war now.

The only truly effective way to stop the missiles is negotiation. At the beginning of November negotiations aimed at stopping the missiles were in progress, involving Al Jaabari, and there seem good grounds for believing that a ceasefire was at the point of being agreed, when Al Jaabari was assassinated (along with eight other people who were in his vicinihty,including a seven year old girl). There have been no indications that this happened because negotiations had failed, and some that suggest that it happened because they seemed to be succeeding.
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"Hamas does not want peace. It wants all Jews dead." That's more or less what is called a "blood libel" when that kind of thing is said about Jews. It is just not true.

Hamas are a ruthless nationalist organisation, which has carried out many terrible terrorist actions. In all these ways it is closely analogous to the Zionist organisations who founded Israel in their battle with the British, and with those who opposed their aims.