a rule of law. If you cannot control your people then you are not in charge and cannot be a leader signing any agreements. On other hand if abbas will show Israel that he is serious about being a neighbor, a real one, with good intentions and a good will then hope for peace how ever small is there... and mutual confidence building steps must come from both sides. It takes a long time to get mutual respect and trust..so do not rush things as it might be a disaster....
Jerusalem light rail conductors striking over new train schedule (Haaretz)
from the article: Hundreds of Palestinian troops deploy near restive West Bank camp