Benn's thesis that absent an investigation the government will corrode is flawed. Because the government, and the governing system has been corroded for a long time, this 'affair' could , and did take place. Israeli governments, successively have been rife with intrigues, back-stabbing, and therefore with flawed decision-making processes.
Monitor: Airstrikes hit Islamic State stronghold in Syria, killing at least 13 (Reuters)
from the article: Yes, investigate