Oh, definitely; I'm not condoning kidnapping and rape. It's illegal and immoral. But this is *fictional BL smut*. If we applied real-world expectations, then the story would have ended when Yujin got on a plane. And I honestly think people would have found a reason to be pissed about that too.
Yujin would never have come back on his own, so my question is how did people expect them to be reunited, if not by force on Aaron's part? All the complaints are just getting excessive if they don't like the direction the story went, they should just stop reading.

How did people want the story to go after Yujin fled? If people wanted real-life behaviors, then Aaron would have given up (because that's the reasonable thing to do when someone literally abandons/flees from you) and the story would just be...over. Obsessive red-flag is the only way this could go and I'm here for it.