The predator-prey competition and mutual adaptation is the main driving factor of biodiversity. The parasites are also sort of predators.
Well TB. (can I call you tuberculosis?) I remember an observation of Chimpanzee tribes. The observers noticed that the biggest, strongest, meanest bull chimps attempted to monopolize the females in estrus.
The bull chimps wound up spending their time patrolling around their encampment, chasing away intruders and fighting with the other bulls.
Meanwhile (Oh, you've heard this one before?) the females were sneaking off into the bushes to mate with the runts of the tribe.
Cause evolution don't care about your infantile ideology. All that matters is surviving long enough to reproduce.
TheGhostofOtto1923
Jan 2, 2018These games go on for days, each victor killing the other, until only one remains, the greatest warrior on the entire planet.
He is led into the cave to claim his reward, whereupon the berserker kills him.
Berserkers are self-replicating machines that have one mission: to eradicate all life. Since this berserker was not strong enough to do that, he staged the games to weaken the species. He did what he could, given the circumstances.