I'm less worried about machetes since they can't kill the whole human population. Even something as horrific as gas chambers only killed a fraction of a percent

I'm less worried about machetes since they can't kill the whole human population. Even something as horrific as gas chambers only killed a fraction of a percent of the world population. Genocide is ancient, but humanity somehow stumbles on as a species. I'm more worried because we developed technology capable of wipe out all of humanity (and potentially, all life on Earth) in the fifties with thermonuclear bombs. The number of potentially humanity-destroying technologies has grown exponentially since, and with biological weapons, the cost and complexity has fallen. I can think of directions to take humanity to take extermination off-the-table, but we don't seem able to implement big changes anymore.