It’s not us a “species” which is disgusting. It’s capitalism and a history of settler-colonialism which enforce disgusting behaviour.
Humans learn through language and culture. Yes at the moment the vast majority of humans blindly follow along in behaving in an abhorrent manner, but that doesn’t mean our fate is sealed or that we’re incapable of change, and building a new culture which encourages cooperative and better behaviour.
You can make the most peaceful and prosperous nation, with the most pro-human culture, but it’d be only a matter of time until someone takes advantage, spread negativity, and/or take hostile actions to get a slight advantage in life. We like our pointy sticks, the feeling of power, and the comfort the accumulation of resources gives us.
Sure, but a lot of other humans didn't. Can't much write off an entire species because we failed to prevent an outlier from gaining power for a little while.
Yes you can? Capitalism was very much at the root of the conflict. It can accurately be reduced to capitalism. You can elaborate and provide further detail to how it happened, but that doesn't change the big picture.