Originally Posted by Turnbull
I've posted earlier that Sol would have tried to kill Vito even if Sonny had kept his mouth shut, Vito's "no" put Sol's back against the wall--he either would have had to return to Sicily empty-handed, or else try to kill Vito and negotiate with a greatly weakened Corleone Family. Vito's big slip was to send Luca to the Tattaglias with the ridiculous story that Luca was "not too happy with our family"
Sure thing Turnbull Sollozzo cannot allow another man to hold him back Vito's "no” and Vito is a dead man

Sollozzo's slip ups, among others -
  • Sollozzo was smug he had the backing of Barzini and all the other families unbeknown to the Corleones
  • mistakenly believing Vito's hothead son Sonny, the other two kids, Tessio and fat Clemenza, would still do business with Sollozzo even after Sollozzo tried to kill Vito - twice
  • thinking because Sonny was hot for Sollozzo's deal, he could get Sonny on board not realising Sonny's very gaffe, tied Sonny's hands
  • underestimating civilian Michael
  • feeling invulnerable being guarded by the New York Police Captain

Vito was slippin' big time Ten years ago could Sollozzo have gotten to him?! Let alone....sending Luca to the Tattaglias with the ridiculous story that Luca was "not too happy with our family"