Viserys faces the reality of his decision years before.
She had grown into a beautiful woman, his baby girl, HIS Realm's Delight. Even with the ink he could see etched into her delicate flesh, she was still stunning and it hurt. This wasn't what was meant to happen. He and Aemma were supposed to be there to watch her grow into womanhood, help find her a bridegroom worthy of her, see her marry, see her belly swell with child, see her exhausted, bleeding, covered in sweat but beaming with her newborn babe in her arms. They were supposed to see their daughter happily married and surrounded with her own children and still good friends with Alicent, who would have her own good husband and children.
Yet, he himself gave the order that killed his Aemma and for nothing. The babe didn't even live. Then he went behind Rhaenyra's back and married her best friend which caused a rift between the girls. To make things worse, after accusations were made of his young daughter ruining her virtue and at the advice of his Hand and new Queen, he banished her for life just like he had done his brother. Baelon would be ashamed of him. He had driven away all of his kin and for what? A barren bride? His only child having no interest in him and having fully embraced a completely different life far away? Grandchildren whom he still hadn't met. Was there any way he could earn her forgiveness and bring her home? Somehow he doubted anything would work. He trusted the wrong people and now would bear the shame and punishment for the rest of his days.
As for his barren bride, suggesting that his baby girl gets sent to the Silent Sisters for her sins? Accusing her of being a whore, AGAIN? Commenting on her less than perky breasts caused by multiple successful pregnancies and births? Well, if Alicent was actually capable of doing HER duty and providing HIM with living children, her breasts would also be less perky and her figure more curved and womanly than the rail thin creature she's always been. His daughter might have scars but it's proven that she's actually done her duty as a wife. Plus her husband CLEARLY doesn't mind the scars and DEFINITELY don't mind the condition of her teats by how he was treating them.
That drew him to another topic of sorrow. His son by law. He knew almost nothing of the man and yet he was clearly a muscular man and cared deeply (and greatly lusted after) his daughter and she was obviously in love and lust with him. This man was a BASTARD for Gods sake, completely unworthy of the daughter of a king but it was his, her kingly father's stupidity, who robbed her of everything and led the pair to find one another.
In many ways, he hated the man. HE got to see his baby girl become a woman. He married her. He's cared for her. He's provided for her. He's protected her. He loves her. He gave her a home when she had none. He gave her a family when she was cast out. He's gotten to see her swell with child, to see her holding her freshly born baby in her arms, see her children grow and to be there for her. Everything Viserys wished he was part of, the Danish bastard got to be. The worst part of it all was that Viserys could only blame himself. He cast his daughter out. She wasn't abducted by the man and forced but rather was banished by her own father.
If only he could turn back time to when his daughter was a babe. Then he could hold her tightly in his arms once again. He'd have his Aemma, Daemon and Rhaenys with him. He could refuse the crown in his cousin's favor, treat Aemma better and not force so many babes on her, keep his brother close and cherish every moment he had with his precious child. Laena, Laenor and Rhaenyra could have grown up almost like siblings. He would have never been expected to sire a son. Daemon would have been free if Rhea Royce years earlier. Aemma might still be alive and he would have never married Alicent. By now, he would actually know his brother's children (whom he knew his brother and Laena had but not the number or gender) as well as have his grandchildren close to him. Life would be good but it wasn't to be.