I'm pretty sure it all comes down to the fact if we can just not kill ourselves for being a different race, religion, gender etc.
I do completely agree with you there. But the important thing that I have relised is that people almost never kill one another just because of these differences.
Even the most brainwashed will struggle to kill another person because of superficial differences like race or religion.
The reason we are killing each other over these seemingly pointless differences is that a significant proportion of humanity sadly have a clan mentality - TBH it is probably built into every one of us.
This mentality causes us to create factions based on these clans, and we use these clans to fight one another for perceived gain and domination.
Obviously whatever the winner gains is not equally (or even fairly) shared, and more often than not over-exaggerated.
If we overcome these superficial differences, we will likely divide ourselves using different parameters, and start butchering one another for other crap.
Sadly, I believe war will continue as long as humanity exists.
Everyone wants their dream job but there's the low jobs that have to be done to keep society circulating.
In places like Sweden where there is a very small salary range, there is no professional disparity, and their society is running pretty well.
Building caretakers kr23,000/month; Physiotherapists kr26,700/month.
People go into their jobs due to interest and ability, not the persuit of money. IMO that produces the best workers, and society as a whole.