perhaps disarming them would have caused or still cause a civil war amongst them. Now, if they agree to the 3 conditions during at least the talks between President Abbas and a PM of Israel, then that's some progress. Remember, if they agreed to reconciliation with Abbas's Fatah, then they agree to the agreements so far attributed with the Government of Israel. President Abbas agrees to a demilitarized State of Palestine, so they'll have to turn in all arms and change charter anyways. It's achievable because the bottomline is enhancing the socioeconomic situation for the region and that's what the Palestinians want. Israel has to have security guarantees which is unlike the situation of their adversaries, who are not threaten from a security perspective as Israel is.
Police disperse hundreds in brawl in Kafr Manda, northern Israel (Haaretz)
from the article: Striving for an illusion-free Middle East peace