Again, Luke seems to be expecting this response. He turns partially away from Wan. "Peace isn't that simple."

Luke would know all about that, having just come from a decades-long struggle to regain peace. Many people died, families were torn apart, entire planets were utterly destroyed. There are people he loved that he'll never see again... for peace. Peace often doesn't mean what people think it means, though that's not easy to explain.

He then turns back to face Wan, looking somewhat carelessly amused. He's been through this discussion a million times. "You would still be arguing with him right now."