You're taking about all of humanity, not just people who have committed genocide. Not everyone on earth has committed genocide.
My sample size is in the thousands - more than that if you include everyone who has participated in a genocide. Even more if you include every bigot.
Are you only including bad people in your sample? Obviously that would end up skewing the sample towards people being bad. Have you heard of the term representative sample in statistics? That's how I'm using it.
The problem - confirmed by my therapists - is that there were exactly zero samples of anyone contrasting.
I'm sorry you haven't met any non terrible people. I've met plenty. I hope you can meet some more people to change that.