

There is not really any card Hamas can play. Israel is allowed to genocide all Palestinians with full support of the West.
And Israel will gladly kill all the captives in Palestinian custody with full support of the Israeli public.
When faced with the West which has absolutely zero morals the dilemma becomes very tough.
Israel has proven to be the leader of Europe and America fully in control of their politicians. The amount of discontent of the public is irrelevant and is ignored. Likewise they own the Western media which will gladly publish any angle Israel wishes. So there is no counting on the West to do anything except send more weapons and money to Israel. Hamas likely hoped that there was a semblance of humanity in the West to pressure Israel but that does not exist.