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.
Regardless, our (USA) parties are in fact the biggest blockers to our functioning correctly as a liberal democracy. One is desperate for votes from anyone, the other party is terrified to pass anything or imagine any kind of future that isn't a slightly less grim version of what the republicans offer. Just by our ability to come to a consensus and do things as a country, we seem to have ground to a complete halt. So yea, people should be a lot more critical of whether or not we're actually espousing the democratic ideals we claim.