You can't forgive someone that doesn't have remorse. In fact, forgiving someone that isn't sorry is disrespectful. It's an "I'm better than you" power play.

I had exactly the same experience. He was his own planet. No bridges. Not the same language.

I thought very much like that until a week ago. Now I get the feeling a shift is coming and I can probably understand and forgive, as much as that can be done while keeping healthy boundaries. I am not there yet lol. There may also be psychological benefit in connecting with an archetypal father internally, if the real thing is not worth the effort.