That’s such a weird take. I mean you’re right, that is exactly the argument, but it doesn’t hold any water. To defend against Hamas attacks, Israel would need a huge border fence (check), a vastly superior military (check), constant surveillance on Gaza (check), Iron Dome (check), and even morally questionable methods like full control over the Palestinian population registry to track criminals (check). The fact that they had all those and still failed self-defence just adds to the argument that killing tens of thousands of civilians and destroying the majority of civilian infrastructure (while making the vast majority unusable) and completely debilitating the medical infrastructure and blocking humanitarian aid (also via criminal methods) and

Killing members of the group; (b) Causing serious bodily or mental harm to members of the group; © Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part

is actually genocide.