You will never be able to make him understand why you're cutting off contact. You may not see that now. Spork knows, I didn't for a few years. But it's true, if you try to explain he will simply try to debate or he'll push you off as immature.
To save your own sanity, all you can do is cut ties completely.
Other people here may offer differing advice. Some of them haven't been through this situation, so they can't know the torment you're going through.
I can only speak from my experience.
Cutting them off was the best thing I did for my mental health. Cutting them off was not easy. I still think of them sometimes, of what might have been. But I'm comfortable with my decision, I'm confident I made the right one. Through plenty of evidence-based psychology, I now understand the reasons.
Getting back to your first question: sometimes, it's good to be selfish for the right reasons. Maintaining your own health and well-being? That's the right reason.
Your father's desire to hurt people is far more selfish than making him discuss something. But if you make him discuss it, he will only act threatened and refuse to see your point of view.
You will only begin to heal once you cut him out of your life. I don't say that lightly.
Again, if someone hasn't lived through a situation like this (and hasn't had to make the same hard decisions), they can't understand. So don't be afraid of the naysayers.
I never even bothered to make an Epic account to get the free games. I have so many games on Steam and GOG already, and I do most of my gaming with a Steam Link on my TV.
The edges of his lips are downturned in the photo, but they're a bit upturned in your painting.
Also, his upper lip is stretched a little thinner in the photo, and pressed more tightly against the bottom lip.
I don't usually reply to these, but since you asked, figured I'd mention.