My take, Michael finally twigging during his train ride as to why Roth from Miami was openly backing the Rosatos, the Corleone rivals in New York against the Corleone people, in effect against Michael “led Michael to conclude, very soon after the Tahoe shooting, that Roth was behind it”
Originally Posted by mustachepete
I think that all we're left with is that Michael is reading the people around him and has decided on Roth because of the audacity of the attempt, and also because Roth has just made a friendly concession to Michael
I am not sure Pete how “Roth [having] just made a friendly concession [presumably moving Klingman out] to Michael” make Michael decide Roth was behind the Tahoe shooting? Wouldn't the “concession” sway the suspicions away from Roth?