...Point is, though he made a key error in judgement, he did not overlook the nuance of examining and planning the internal structure. This combined with Michael's discarding of Fredo- which I believe happened long before Michael's "you're nothing to me now" line opened the possibility of betrayel at the highest and closest level...
Ok, then.
Having made these valid points, and knowing Fredo's 'history' and propensity to 'take sides against the family', had Michael not suffered this 'weakness' of an 'unsympathetic persona' and therefore lack of foresight into Fredo's discontent at being stepped over leading to his potential betrayal...what sort of role do you suggest he could've awarded Fredo that would make him feel 'important' yet not put the entire Organization in danger?
And if there were no such role that could be safely given to Fredo, how could Michael have handled him and kept him happy, had he posessed his father's 'people skills'?
Apple