So those who claim MBS was responsible may be right or wrong. Without a clear definition of how his potential responsibility relates to US national interest, the matter isn’t even necessarily something the CIA should worry about at all.
By skipping that step and jumping right to PR to help fuel moral indignation in Americans, the CIA is way way way out of bounds.
The agency is not supposed to be a bunch of wise elders providing moral guidance, it’s supposed to protect national security.
Quite likely most senior CIA officials have far more blood on their hands than MBS.