Well friends,
I haven't read the book for almost five years, but I will still take a crack at it. Quite simply Hagen screwed up. He was good with the law and relations. He, like previously was said, he is not a war time consigliere. And instead of killing someone who is legally a brother of Mike (he was adopted), he simply took him out of the game. He still loved him, and allowed him to stay as the family lawyer. But I think you two have already said everything so this isn't really needed. Ciao. Ciao.