TB, it's beyond me why in the world Sollozzo would think that his murder (or even attempted murder) of Vito would not enrage Sonny beyond all reason. Even though Sollozzo tells Tom that Sonny's coming after him with everything he's got would be Sonny's initial reaction, Sollozzo failed to realize that that would be Sonny's lifetime reaction. He goes on to tell Tom that one can't reason with Sonny. Even in his phone call to Sonny, Sollozzo acknowledged Sonny's temper... a fatal lack of understanding.