Why is it so hard for people to see what is happening before our eyes.
You can't ask elderly Armenians...they were killed in massacres that nobody wants to acknowledge happened.
Ask an extremely elderly German.
One could go ask the people in Darfur. Dangerous, but doable.
Before that, there were legions of others, united behind or forcibly subservient to despotic rulers, throughout the history of humanity.
Or you can just look around the world, and answer your own question.
In this century, Islam is evil on the march.
Humanity always gives evil contemporary nicknames, but it is never very difficult to see it in action.
The better question is, what, if anything, will we do about it?