So Hamas are just some completely separate entity that dropped into Gaza and is made up of what? Iranians? Jordanians? Lebanese?
Would the bloodshed have stopped in Northern Ireland if one side or the other was completely and utterly wedded to the idea that every inch of Northern Ireland was theirs and theirs alone, that they would never entertain peace with the otherside, and that they'd never stop fighting until every single person on the other side, man, woman and child was driven into the Irish sea?
I've never said Israel are right or justified in their actions but, the fact remains that while Hamas are operating in the area there can be no peace. And while there's no prospect of peace Israel will continue to do what they do becuase that's how armed conflicts work.
You don't give your enemies respite and allow them time to organise and plan. You don't spend your time and resources helping enemy controlled lands, you seize occupied areas, take control where you can, and make life difficult for those in the remaining occupied areas in the hope of weakening their resolve.
That's warfare 101, just look at Russia. Putin and his lot decided to invaded Ukraine and the global response was to put in place a raft of sanctions designed specifically to make life for the average Russian untenable. Did the average Russian deserve to be punished for the actions of Putin? According to many on here no, yet there was no international outcry when the sanctions were enacted.
Gaza is enemy controlled territory in the eyes of Israel , the ruling regime have not only declared there will be no peace but, that they will continue to actively try and kill Israelis. Why would you, or anyone, expect Israel to provide support to them?