Stop confusing me!
Both Lana and Turnbull put up excellent case for and against it's justification

Eeny, meeny, miny, moe, --

We debate how Fredo's murder was a horrific act but he did exactly the same and would have been just as horrific and guilty of fratricide if Michael had been killed He was complicit in trying to get his brother killed He stepped over me He did injure him

He might have been mostly honest with Michael about Ola bumped into me in Beverly Hills -- However everything before and since was devious, dishonest, deceitful He was quite the deep thinker too, coming up with all those lies, lie after lie, he was feeding Michael

No doubt he betrayed the family and set his kid brother up to be murdered for the Donship