The Geneva Convention's definition of genocide. "... any of the following acts committed with intent to destroy, in whole or in part, a national, ethnic, racial, or religious group, such as: (a) Killing members of the group; (b) Causing serious bodily or mental harm to members of the group; (c) Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part; (d) Imposing measures intended to prevent births within the group; (e) Forcibly transferring children of the group to another group."

You seem to defend a and b as necessary costs of doing business. Isreal's frequent attacks on civilians, journalists, medical personnel, and humanitarian groups seem to conflict this. Look into the killings of clearly marked journalists.

I'd argue that c is met by Isreal's control of Gaza's water and power along with the targeting of hospitals.

The Geneva Convention on collective penalties. "No protected person may be punished for any offense he or she gas not personally committed. Collective penalties and likewise all measures of intimidation or of terrorism are prohibited."