“Violence” is a human constructed concept.
It is how the world has worked since the beginning. Plants steal nourishment from the Earth. Plant eaters destroy plants, to steal the nourishment. Meat eaters destroy them to steal that nourishment etc.
Fighting each other makes many species better. It’s a big part of natural selection. Fighting, killing, stealing etc is how resources are gained. If an animal isn’t good at “violence,” it will be lost to the pages of history.
Violence isn’t necessarily the problem. Nor is population. It’s the ability to choose when violence is absolutely necessary, or the inability to coexist, and use the resources we have efficiently, that leads to problems. Combine that with greed, and “peace” (also a human concept) is unsustainable.
We have the knowledge, and technology to sustain everyone and more. But it won’t work without massive change in the way society “works,” and how we all view and treat one another…