"According to my own principles, I must die"
In Bruges the big bad Harry (Ralph Fiennes) says earlier in the film "if I had killed a little kid...I wouldn't have thought twice. I'd have killed myself on the fucking spot". At the end, he does shoot a kid (or so he thinks) and says "You've got to stick to your principles" and kills himself on the fucking spot.
The recruiter in Squid Game plays games with his victims, but always follows the rules. He plays Russian Roulette with the protagonist, and 5 out of 6 empty shots have been taken, so the last shot definitely has the bullet. Since he always follows the rules, he shoots himself in the head.
Paladin Danse fights for the Brotherhood of Steel in Fallout 4. The Brotherhood is adamantly against synths (synthetic humans), they are their sworn enemy. Later on in the game, the Sole Survivor (player character) finds out that Paladin Danse himself IS a synth, but is unaware. The Soul Survivor can choose what to do, but if he/she chooses to kill him, Danse says "I am a synth. I need to be destroyed." And praises you for deciding to kill him.