My perception that Hamas is not as pragmatic as Fatah. Fatah controls the West Bank and while no friend of Israel realizes that terror will not help them. Hamas on the other hand adhere to a strict dogma of not cooperating with the "Zionists", ie. Israel so any incentive for not participating in terror will not work.
Turkey launches heaviest air strikes on PKK since campaign began, official says (Reuters)
from the article: Israel needs to rethink its Gaza strategy before it's too late