Edit: It looks like the argument here is that the US is not calling for an instant ceasefire, but instead saying that one is very important to have. China and Russia say it should be immediate. The US also tied it to hostage talks.
Another resolution is in the works to call for an immediate ceasefire, but the US is expected to veto it because they believe it could endanger hostage talks.
This is a slightly more interesting moral argument but I think in general I would have to disagree. Particularly because it doesn’t seem like the hostages have done much if anything to blunt Israel’s aggression.
They haven’t, but we’re not talking about now. We’re talking about later when this mess dies down. The hostages are likely to make a difference in Gaza’s post-war fate. And given the stakes (Israel has been pretty clear they want to re"settle" Gaza) I’d say while the hostages are victims and deserve better we can’t blame Hamas for holding onto them.
Edit: The hostages are also likely to be involved in things like how much food and other goods Gazans are allowed through the blockade, trying to get Israel to not do random airstrikes and other such things.