The 7th October massacre (specifically the Nova festival) was genocidal and facilitated by Hamas, either directly, or indirectly by them not having control of the other troops they worked with. In either case as de-facto government they are responsible and have to indict the perpetrators.
There are plenty of groups not led by Deif, Haniyeh or Sinwar in Gaza.
Yes, lets put blame to commanders committing genocide.
Some more aligned with anti imperialist Marxists than Hamas.