These aren't people you can reason with. These aren't people you can buy off. These aren't people who will eventually see sweet reason, the light of day and want to live in peace. These are people whom you have to destroy in order to obtain peace.
If anybody wondered why in the Old Testament God told the Israelites (under Joshua 3500 years ago) to completely destroy the pagan peoples inhabiting the Promised Land, look no further for the answer. Some peoples are so twisted and depraved they are simply irredeemable. The Muslim Palestinians today stand in the front ranks of such peoples.
There is always the next election, and in a parliamentary system that can only take a month.