Hamas is basically an organization established by the Refugees . Settlements are the problem and this violence has increased always because of Settlements since the earlier 70's in the occupied territories .. I have did a detailed research on this Palestine Conflict and i can come up with dates and events which have increased the violence . Hamas do accept a Palestinian state prior to 1967 borders . Existence of Israel is not in danger from anyside .. The real question is this .. Can Palestinians have a Independent state prior to 1967 borders which means 22% of the British mandate , Palestinians have already accepted the Soverginity of state of Israel on the 78% of the British Palestine ..