"There's a reason the Sith Empire collapsed, from what I understand. Too much infighting and lack of diplomacy. Then again, our Jedi brethren are all but exterminated. What little was left of them, I killed."

Just like his grandfather before him. Darth Vader had been a powerful Sith lord except he had been weak to his family same as Ren himself is weak to Rey. It causes him to war within himself, to think there are other truths. To have everything upended after so long - it's maddening.

"You've not chosen to eliminate me even though I am a rival. Why?"