Don Tommasino was looked as being a nice guy, but after killing Don Ciccio ( who was the bos of the town), didn't that make Don Tommasino the new boss of the town? and there aren't that many "nice" bosses in Sicily

"Well you just do what I tell you to do! Goddamn it! If I had a wartime consiglieri -- a
Sicilian -- I wouldn't be in this shape! Pop had Genco -- look what I got." - Sonny Corleone