If you have a jar with red ants and black ants in it, nothing notable happens.
The ants just mind their own business and go their own ways.
But give the jar a shake, and apparently the ants take on each other. The black ones feel the red were the cause of the jar-quake, and vice versa. And they literally fight each other to the kill.
But they don’t realize that it’s not them that caused the problem, but the jar shaker.
Don’t we behave similarly as well?