I can name four high ranking Hamas officials that were assassinated by Israel after proposing truces where they accept Israel as a nation.

Yassin. Jabari. al-Rantisi. The latest one is Haniyeh who opened up for a long term truce with Israel AND recognizing Israel as a state.

These are just the people from the top of my head. They were all killed within months of proposing long term truces with Israel.

Not nice people, but still people with power to make a change. Israel has shown again and again that negotiation should be done by force.