Why do people keep on seeing the bad things that people have done? Why do we judge other people quickly sometimes?
Is it in human nature that's why it's happening or is it the upbringing of the individual that he or she has seen growing up?
What can be done to be better and not to judge other people just by basing on looks but looking deeper into his or her character?
Share your opinion about it.
To change this you need to do social engineering for a few generations. Eventually the hate mongers will die off and all that will be left is good citizens.
The problem is that many of the rulers specifically incite hatred. Enough provocation to then several generations have felt its effects.