Hamas has been looking forward to implement Allah’s promise whatever time it might take. The prophet, prayer and peace be upon him, said: “The time will not come until Muslims will fight the Jews (and kill them); until the Jews hide behind rocks and trees, which will cry: O Muslim! there is a Jew hiding behind me, come on and kill him!”
As it was not enough, this document includes reference to the notorious anti-Semitic forgery 'The Protocols of the Elders of Zion' that is to say the myth of a Jewish plan to dominate the world (via Norm):
Today it is Palestine and tomorrow it may be another country or other countries. For Zionist scheming has no end, and after Palestine they will covet expansion from the Nile to the Euphrates. Only when they have completed digesting the area on which they will have laid their hand, they will look forward to more expansion, etc. Their scheme has been laid out in the Protocols of the Elders of Zion, and their present [conduct] is the best proof of what is said there.
And that’s how the whole matter is summarized by Hamas charter:
Israel will rise and will remain erect until Islam eliminates it as it had eliminated its predecessors.
So why on earth should they want a truce “before” they wipe out their hateful enemies from the face of the earth? And, what is more, why should they want to stop the suffering of so many people in Gaza when their sacrifice is being used to disseminate hate propaganda against Israel?