It's well know by know that those who did the most incitement, like Avishai Raviv with his group Eyal, was in fact agent/provocators of Shabak. It's likely the the murder itself as well was staged as an attempted murder by Shabak in order to blacken the right and especially the "settlers". Somthing might have gone wrong, and Rabbin was murder in real.
Key U.S. House Democrat cites troublesome issues in Iran nuclear deal (Reuters)
from the article: Rabin's murderers are still free and happy