@Mochimon :
I think in a way he's trying to...well, 'warn' Ruda as someone who's experienced what it's like to see the extreme result of that path.
Because right now Ruda think that as long as Dan-I come to rely on him, some pain to her is acceptable (while also having some self-loathing about the methods of his parents)
But Ju-In have seen it on that day and refuse to ever let that repeat.
Which is why sometimes I want an author to give a 'what if' chapter where characters like Ruda get to see, and regret, the result of their plan coming true an the one thing they want the most break in their face.