Something similarly horrifying, but much redder 🤢 I wonder what would happen if you put some humans in a sealed plastic container and added Ebola?

The OP is classic Social Darwinism, which is what you get when sociopaths set out to use vaguely misunderstood scientific philosophy to justify their own antisocial behaviour. The apotheosis of this is Agent Smith in The Matrix.

The particular misunderstood science here is the ecological concept of food webs. This person is still using the "food pyramid" version of this. Which ecologists abandoned a *long* time ago, because it ignores all our everyday predators of the single-celled and fungal varieties.