Whilst "Fredo was weak, not respected and incapable of making a move / orchestrating grand plans" on his own! "It'd be just a matter of time before another of Michael's enemies approached Fredo with an offer to finish the job"
But how?
If he were exiled and cut off entirely from Michael and the Family business, he would have no value to Michael's enemies and would be no threat to Michael.
"A man in my position cannot afford to be made to look ridiculous!"
