This wasn't necessarily a Mossad operation, but rather a faction within the IRGC working on their own.

Clarice Feldman - @NiohBerg New theory: This wasn't necessarily... | Facebook
@NiohBerg - New theory:

• This wasn't necessarily a Mossad operation, but rather a faction within the IRGC working on their own.
• Whether they communicated with Israel or not, they would need highest level clearance to access Haniyeh, let alone smuggle a bomb. 
• These must be high ranking, and VERY trusted individuals. 
• Otherwise the operation could never work. 
• It's not likely that Mossad agents work at this level within the regime.
• A massive amount of Iranians hate the mullahs and Arab terrorist proxies - the IRGC isn't excluded here...