I agree with you...but understand:
Yes - it was mutual about Michael getting out. But before that, you wouldn't have thought he gave a damn about his father.
Him getting into the "family business" was a knee jerk reaction to getting snuffed by The Captain after somebody breached
his familys' pride...you get the sense that that is how Mike made all his decisions: somebody said something he didn't like,
next thing you know they're dead. He kept "pulling" himself back in!
I mean, think about it...if the roles were reversed and he was having problems with the Rosato Brothers, what do you think he
would have done? You think he would've humbled himself to fly across the country to see his Don like Frankie did?
Or would he have bombed their cars and worried about all of that later because he was behind on his 5-year plan he promised
Kay?
To your other point, Michael wanted to be legit because...he wanted to be legit. Because again - he didn't respect the game.
You can tell in that meeting he had with Senator Geary, as I mentioned earlier. The Senator didn't want "them" there,
even though he was just as "crooked" as their business. That's why, as you say, he "didn't set up the proper infrastructure
below him" - he didn't think anything he was doing was proper.