I still don't see how he could provide any substantive information to any Corleone crime family enemies once he was exiled from the Corleone crime family. Someone may be able to provide an example of such information that would not be otherwise available to the underworld.
Agreed, Olivant.
And he didn't even exile Fredo fully - Fredo was still allowed at the compound.
While apologists on these boards abound, Michael himself clearly regretted killing Fredo later in life. In his confession to Lamberto, he explains the killing by saying "he injured me." Not, "he was a danger to me" or "he turned against the Family."
The fact that he does not seem similarly remoseful for anything else in his life - and was still an active participant in Mafia culture and participating in murderous acts - is further evidence that Michael himself did not believe Fredo deserved a death sentence, and that the killing was based on Michael's anger at Fredo's betrayal rather than any kind of clear-headed risk analysis.
