I agree that Michael is tragic in many ways.

1) Initially, he never wanted to be apart of the family business. So we know his heart wasn't born into greed or cruelty.

2) He lived a life where his family was constantly in danger.

3) Once his father passed, No one else is capable of protecting the family.

Hard to complete his quest for legitimacy when there is too much unfinished business. Walking way would be difficult too, once you give up all your power..his enemies would still seek him out and wipe out the family just to be sure they don't ever rise again.