Exactly Pete. I believe there is even a deleted scene from the party where Fredo is telling his wife that important people are there for Mike and Kay and she needs to behave herself since Mike is the boss. Now if Fredo knew Mike was on his way out I doubt he be too worried about what Mike thinks. Look everyone has a right to their opinion but I just don’t see much if any evidence that Fredo had malicious intent to either help kill Mike or incapacitate him to the point where he couldn’t lead the family. I think the simple truth is that he wanted to do something on his own that would gain him respect and in his mind help the Family. Was it stupid? Absolutely BUT was it worth a death sentence? I don’t think so when comparing it to Corleone traitors who we know actively help try to kill Mike, Vito, and Sonny.