You only have Israel to blame for this. They have roadblocked and tried to ridicule Abbas so much that the normal folk have lost respect for him. When Abbas' moderate attempts have failed and still fail daily, you think people will keep trying them, or move to a more radical option?
Israeli PM to Palestinian President Abbas: We must fight terror together (Haaretz)
from the article: At Ramallah protest, Hamas’ green overcomes Fatah's yellow