Well it's not splitting hairs. One should be able to identify the proper group resposible.You’re splitting hairs. The key fact is it wasn’t the IDF on the available evidence.
While it looks increasingly likely that IDF wasn't responsible , it will not be accepted by the Arab states, until it's proven so by an independent Investigation given Israel's past history of assigning blame on attacks to the Palestinians, but later proven otherwise upon independent investigations. Therefore the skepticism will remain.
And that will not help Israel at all.