Don't you think that Michael's quiet, serious personality made it easier for him to be cunning? Say, more so than maybe Sonny?

I mean he never smiled and always looked in the eyes when he spoke to anyone, never was a loud mouth giving any information away, not to mention his previous "college boy" status, which I think was to his benefit as well. He could be extremely cunning and yet still be himself and no one would be the wiser. He was excellent at not letting others know what he was thinking and could tell a lie as seriously as he told the truth.

TIS

"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK

"War is over, if you want it" - John Lennon