That will be the least of their concerns. Hamas is not a challenge for a fully unrestrained Israel. No matter how much you sympathize with them. If Israel decides they want to become genocidal in the total sense of word, they can wipe hamas and Palestinians off the map.There’s 40,000 Hamas fighters waiting for them.
The bigger trap is if they go down this path, Israel will globally cement their place in the minds of millions if not billions of people of them being evil and a terrorist state and their existence as a state will be in danger. The outrage by the populace in the Arab world will be limitless to the point even if these Arabic leaders cynically only pretend to care about the Palestinians for political purposes may find themselves facing threat to their power if they don't do anything. Anytime Israel tries to play a victim card, after a generation of people have seen the evil real time will have no sympathy for Israel. They will reek of the same stench on a global scale as South Africa did before apartheid regime was dismantled.
I know that folks on here will say "but Israel is already evil and all the things you said already the case" but regardless if that is right or not, for now Israel whether it's through effective bullying and pressure and the sympathy they garner from some people due to their history, they do get some support. Also, many people before this never knew or saw the full scope of abuse Israel has enacted on the Palestinians. They are sheep who simply buy the endless pro Israel propaganda we are bombarded with.
But the power of that propaganda will evaporate if everyone watches Israel commit genocide in real time. Especially since people are paying attention to this conflict more than any time in recent history. This is what Hamas wants and Israel may be dumb enough to fall into this trap.