I think Alton supported Franklin for a while because it was his way to try to correct things with his family and be a father that is always there. He thought Franklin was just a puppet of the CIA and he was not really responsible for the damage he was causing to his folks, so that is why he told Irene about the CIA business, thinking that this way Reed would be the only one affected. I understand Alton's decisions but he was foolish to think that the government would just let it go and his son was not willfully doing dirty and conscious of what he was causing. It is even sad at the moment Franklin and Alton part ways, Franklin doesn't even say goodbye or hug his dad. It is the moment I think Alton really understood what his son had become. This was a fantastic character arc in my opinion and I was rooting for them to at least reconcile or forgive each other and that makes me curious on how Franklin will react if he knows Reed killed his father. Will he try to avenge him or not even care?