If you shot every person on the planet in the back of the head twice, some of them would survive. Those who survived would be the most resilient. Repeat this for several generations, and you could select down to a near-invincible race. I think the moral necessity of this is self-evident.

RT: https://poa.st/objects/cbf7d9f8-59b4-47f5-8aea-9c3dfbe244d0