Humans are tribal creatures. We try to pretend like we have some sort of 'enlightened mind' but we are still just apes banging our chests. We are, as you said, not a peace-keeping race. We fight for survival so we take advantage of others. From pushing for your next promotion and in the process pushing others down, or to taking the last fucking muffin. It's about us being first. It's about survival. We are social, but it does not extend to a world-wide social consciousness. We are not designed to care for the needs of everyone.
In a way you are right and in a way you are wrong.
Humans are capable of bother good and evil.
Your comparison to current society is a bit problematic, nowadays selfishness is being promoted relentlessly by neoliberaliats and corporate culture is inherently sociopathic.
Many humans like to use our status as parts of the animal kingdom as an excuse for selfish actions.
Nobody can survive on their own, we need to support each other because only healthy communities have healthy individuals .