In all fairness - and, naturally, I am not Hamas - I can sort of understand their position on this one (if confirmed).
The last "temporary ceasefire" or "humanitarian pause" was beyond cynical, if we are being honest:
For about a week, people were not being bombed to death in their dozens on a daily basis. Still struggling to obtain basic life necessities but: at least not dying by being crushed by the collapsing houses they lived in ...
... and then it all started all over again, with even more intense bombardment. Even more fire on the ground.
Frankly, if someone offered me a choice between "die today - or get to live miserably for a few weeks and die after that", I might also just say "fuck this shit, I guess today it is then!".
I have been to a war zone. This particular one, to be exact. Well, the West Bank - at the hight of the 2nd Intifada. Which was "a walk in the park" compared to Gaza 2023 - but it very much did include airstrikes and shelling. And they are fucking terrifying! I never would have said the above back then. I would have thought "well, take a chance - things might change within a few weeks, they tend to around here". But, personally, I would not have that confidence right now.
The entire situation of any "not today, Satan!" attitude hinges on the hope that tomorrow may be better. Take that away and the cost/benefit analysis changes fundamentally.
It is, frankly, a ludicrous suggestion, given all this!
Also, if I were Hamas - again: I am not, I am an atheist leftie and, for somewhat obvious reasons (I should hope) not into Islamism; but I am also a realist: I would not enter any "pause for prisoners" deal. Realistically speaking, more Palestinians have been arrested and imprisoned than released. From a purely "win/loss analysis" point of view, this constitutes a "net loss". Speaking as a corporate executive (which is what I do as a day job): never would I ever renew such a loss-making deal. In my for-profit firm, I would be fired for it!