Well said, Susan.
Your mention of "only humans" happened to make me think of the broader galactic picture. I would think species which are more technically evolved than ours will have to have acquired planet-wide ways of corralling the survival instinct's detrimental manifestations. We're in a place where the detrimental among us remain a planet-wide threat. I figure that overcoming this is a huge evolutionary step: If humanity can stop being a threat to humanity, our societies would evolve so much more rapidly, as the collective mind would be enabled to shift its focus on creativity, rather than on being one step up on ever-increasing existential threats.