"I would try to explain them their mistakes. Show them that their way is wrong. Human being is a selfish person. We believe that our truth is the truth. Words are weapons that can be often much more useful than a ship lasers.
But when the words fail the time for guns comes. History is written by the victor. But friendship is about trust. If he believes in something diametrically opposite he cannot trust me as much as I cannot trust him. Such a friendship then can't stand. But I believe there is way to convince them that what they believe in is wrong."