There's nothing wrong with survival. But you know that already. [ Akechi basically said it earlier. There are times when it's necessary to take drastic measures for one's safety. Ren knows that too, as well as anyone and better than most people.

He fiddles with his chopsticks. ] I think it's just like that sometimes. You have to fuck yourself up. [ He doesn't think he's revealing much by saying this, because he thinks it is just like that sometimes, inescapably. Just a fact of life. ]