I think what so many of you are missing here is the horror of fratricide. Vito couldn't even conceive of murdering one of his children and would turn over in his grave even at the thought of fratricide. What makes Michael's murder of Fredo so insidious, so odius is his keeping him around, accepting him back into the family, deceiving his sister into believing that he had forgiven Fredo, and then using his sister and Michael's son to facilitate Fredo's murder. Thus, Fredo's murder goes well beyond fratricide.

Making strong decisions because he was the Don? A strong decision must be based on necessity. What was the necessity? There was none. What was Michael's percentage? You know what it was? He satisfied his own need, not that of his crime family. In doing so, he showed that he was willing to involve his sister and son in a murder scenario. Madonne! I wish I could think of a stronger adjective to state about him other than insidious.