You are thinking along the lines of burden of proof. In a court of law the burden of proof is on the prosecutor because you can't prove someone's innocence and it's the prosecution that brings the case. When it comes to international law, responsibility lies with the occupier and not the occupied. So while the Palestinians have the right to armed resistance, Israel has the obligation to provide the necessities for life. It doesn't have a 'right to defend itself' because that right only applies when it's fighting a foreign army and Hamas is neither foreign nor an army. Its a militia.

Your case is that Israel and Hamas are equally culpable as both are in a power struggle and the Palestinians are suffering as a result of the direct conflict between the two. You can make that case but no Palestinian will agree with you. Neither does the United Nations. Neither do the majority of people in the world.

Ultimately your position is useless at best and sides with Israel's ethnic cleaning at worst. Have you not heard of the Great March of Return (2018/19)? There were peaceful demonstrations near the Gaza fence and Israeli snipers were picking off Palestinians like fish in a barrel. Even now US physicians are telling us how they have seen children every day who had been shot in the head and chest and there's no way this wasn't precision targeting in order to depopulate Gaza of Palestinians.

So this isn't about winning an argument, its about the crime of crimes.