It was Vito who chose the Mafia way for him

I don't think “Michael actually wanted to be the Don”

No doubt he liked the absolute power of being the Don afterwards but I reckon he was a reluctant Don, had no aspiration of “becoming Don” which was thrust upon him because of Sonny's assassination and Vito's desire to make the Corleones top Mafia family again

He was tutored by Vito longer than a year for Donship

What choices and alternatives did he have at every step of his ascent to the Donship?