Firstly, I have yet to see anyone say that they support Hamas’ actions. What they’ve recognized is that this was an entirely anticipated outcome from Israeli policy.
The reason that people make this observation is because it’s clear that Israel has meaningful agency here, and it’s not clear that Palestinians do. Israel has the option to pursue a genuine peace process or continue ethnically cleansing occupied territory. Conversely, Palestinians largely have the option to die quietly or violently.
I am entirely aware why people find criticism of Israel to be tasteless during an attack against Israel. That said, these attacks aren’t really a security failure or a policy failure in Israel. Periodic outbreaks of Palestinian violence are a part of an ongoing project of genocide. Restrict food and medicine > Face violence > Use it to justify culling young men and destroying basically all infrastructure assembled since last culling until the resistance is exhausted > Return to baseline abuse until enough Palestinian kids reach suitable age to launch a new attack and repeat the process.
As I said, the Israeli government – and by extension, the US government – have the power to interrupt this cycle. And if we really care about the lives of Israeli victims, we have a moral obligation to.