From those differences Humans created envy.
From those differences also arose ignorance.
Envy and ignorance combined and begot prejudice and bigotry, and they were detrimental and divisive.
A few well meaning people created "political correctness" trying to get everyone to ignore differences.
In essence they were removing the good with the bad, and it was resisted.
"From complete understanding comes complete forgiveness."
This at least one person thinks is closer to the true solution.
However, not everyone wants complete understanding.
Not even the one person implied above.