Sustainable reproduction is what enables space travel, expansive species spend their time on infighting, they have no resources to fly anywhere, example: humank

Sustainable reproduction is what enables space travel, expansive species spend their time on infighting, they have no resources to fly anywhere, example: humankind. But even in case of humankind, our exponential reproduction is winding down over time. Irrespective of reproduction, a barbaric species won't be able to fly beyond moon.