The UN force is a peacekeeping force. It's peaceful now, they've stopped fighting and more important civilians aren't getting killed. It worked.

You want a small UN peacekeeping force to do what the much better equipped Israeli army couldn't do. Do you see the problem now? Would you prefer the war to re- ignite?

If you want a long term solution, it will involve disarming all factions. That includes all Moslem, Christian, Jewish armies, and all armed groups with a political/ sectarian axe to grind.