"May you find happiness in your next life..." Deep inside, Kenshin had some guilt when doing all of that. You can tell by his face it's not complete blood thirst.
This is the Hitokiri that Kenshin used to be. He may have changed, but in this chapter we see the cold murderer he once was. This is what he lives with each and every day.
Kenshin was a blood thirsty god back in the days, and to bad for that guy not being able to marry her women. So that’s how he got the first scar for his x?