I fail to see why the problem of Hamas staging up on Fatah in the buffer zone should be of a primary concern and thus, a show stopper. The objective is to stop Qassams at a minimum risk to the Palestinian polulation. Yes, there is potential for more problems. This a relatively small price to pay and it is entirely up to Fatah, who outnumber Hamas 10:1, to take make sure it does not happen. Got any better ideas ?
U.S. Democratic Senator Merkley airs support for Iran nuclear deal (Reuters)
from the article: U.S. lauds Israeli restraint in face of Qassam rocket attacks