>>JeffSn+MF1
Yes, of course there is reason to suspect Hamas is untrustworthy. I'm not trying to argue one should take Israel's word at face value (of course you should subject it to scrutiny as well), but yes, Israel, a liberal democratic state with a free press, strong left-wing movement, and the second biggest tech sector out of silicon valley, is far more trustworthy than Hamas, a repressive, fundamentalist, authoritarian regime with no free press. This doesn't mean they always tell the truth, but there is no equivalence between them and Hamas.
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.