Blame Sonny for a lack of appropriate back up for his Father,
Why would you blame Sonny?
Actually Paulie was under Fredo's jurisdiction. When Sonny complains to Clemenza about Paulie's absence, Clemenza says he asked Fredo if he wanted him replaced, but Fredo said no.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
