Whatever evil is done by some segment of humanity, it can be done by any segment. We are each capable of doing whatever is done by any member of our species, and we must not be deluded about this.
This creates an even greater impetus for us to intervene and stop horrific atrocities. If empathy for the victims is not sufficient to move us, then consider the fact that those who are committing such atrocities, like the genocide against the Rohingya, are members of our own species. By doing what they are doing, they are saying something terribly ugly, not only about themselves, but about us all.