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.
It feels more like an Israeli attempt at using fog of war and the masses ignorance on the matter to soften the reaction and spread doubt about the real numbers. As this talking point was continously used by Israeli spokespersons even after US officials believed these numbers to be fairly accurate. I would be happy to be corrected, I wish the numbers are actually less, and would want this to be the reality.
https://www.wsj.com/world/middle-east/u-s-officials-have-gro...
How are the numbers generated?
So people are asking you to be scientific and critical rather than to uncritically repeat the claims of a belligerent in combat.
Finally, I'm not sure if you're saying this facetiously or if you genuinely don't know what Israel is capable of, or the lengths its gone to to reduce civilian harm but Israel is not doing indiscriminate mass slaughter. That's what Hamas did on October 7.
I mean completely seriously that Israeli occupation forces are engaging in deliberate mass slaughter, including widely reported upon declarations of certain zones as safe for civilians followed by the bombing of those zones (https://apnews.com/article/israel-hamas-war-news-01-03-2024-...).