In terms of specific reasons to doubt the Gaza Health Ministry numbers specifically, I could go on forever about that, but I don't see the point of doing so on HN. It's not a tech-related question.
With Netanyahu and other far right parties in power I'm not sure this is argument you think it is.
Also not great numbers with the free press either:
Better than some in the region, but not great.
And the refrain gets old when used as a cover for Israels terrible actions, but it actively makes me ill nowadays, maybe not as ill as "IDF is the most moral army in the world" when I think about the tens of thousands of kids they have blown up (killed and injured) I suppose.
Not sure if you're a Hebrew reader, but you don't know what you're talking about with regard to journalism in Israel. Have you ever read Gideon Levy? There is tons of criticism of the government and its conduct in this war in Israeli media.
Sorry these facts make you ill. Get better soon!