THIS is problematic. He might not have 'intended' to harm but he did cause pain and he CHOSE to ignore the concerns you brought up. To this day, he is still in denial and abdicating any responsibility in how his actions hurt you / the family.

It was a choice. It was HIS choice. He may not initially have been aware but he heard you and yet, still chose to not give a damn and let his anger loose.

There is nothing to feel guilty about. He did know and he chose not to do anything about it.