I'm in the same camp tbh. I think Israel should not be putting all of Gaza under siege. It's not moral. This will also not work because the Hamas doesn't care about Gazans. It's also not helping Israel (other than some internal politics between Netanyahu and his right wing extremists).
Totally agree on people need to be able to change their minds based on new data and as the situation changes. I'm personally constantly trying to evaluate that. You do need to keep in mind though that data coming out of Gaza is still to a large extent controlled by Hamas. There is definitely a humanitarian crisis but it's amplified by Hamas for obvious reasons (trying to force Israel into stopping the war and allowing it to recover Gaza). Hamas is also benefiting from the crisis and it's actively fueling it. It also needs to have enough food for its fighters to keep going.
Technically from an international law perspective a siege is legal as long as civilians have a chance to leave. Israel can legally lay siege to Gaza city and the northern Gaza strip as long as it allows civilians to move south. This isn't working because the civilians don't want to move, or are forced to not move, or can't move, or have no place to really go to, so it's just not a good idea.
Another thing you're missing IMO is that some of the people attacking Israel here aren't generally in the camp of supporting Israel's right to defend itself against Hamas or use force to free the hostages. If your starting point is either denying Oct 7th or trying to somehow excuse Hamas or even support Hamas then you are not in the same camp as these politicians and you'll never be.
For the people who genuinely care and want to see an end to the war and a path forward, we need to find a way to get Hamas to yield. If there was a path that could get us there from an immediate ceasefire and end to the war I'd get behind it. It's not clear that path exists. In the absence of this path then Israel can and should do better to aid civilians but the war is not going to end.