Do evil spirits exist?

Opinions on this one differ. I take the view  that good and evil exists on this side of the veil and in the inner realms too.  Like many questions, a response involving a few lines is inevitably inadequate. Our main concern should be the harm that  one human being can do to another. Perhaps the greatest evidence of this in  history are the acts of attempted genocide. Events such as the Holocaust, the slaughter of the innocents in Rwanda and now what is taking place in Darfur. In addition, we should not forget the countless lives that have been affected by that dark stain on human history referred to as the Slave Trade. There are some people on this planet that have  experienced many centuries if not thousands of years of persecution, merely because of their race, colour or creed.