There is a reason why the Corleone family outlasted every other family and built the empire to sucess - Vito Corleone

I believe Vito's success was built on his karma. He cared for every person that came his way who had troubles.

Killing Fannucci in godfather 2 was his first sin. But how many people did Fannucci terroize in the community? I'm not saying killing is ok, it's just a movie. But karma makes sense. He's helped so many poor people, thats why he became the richest and most powerful