Yes, these witches will definitely kill us all, so we must immediately burn them without any due process. Don't worry, this is definitely a one-off exception; we would certainly never extend the same claim to any other group or claim that someone is a witch with no actual evidence. We will totally provide you and people you care about with a fair trial when the mob comes for you.
Systems must provide due process, but if you let yourself be slippery sloped into spending time and energy to support your own extermination (e.g. by doing business with nazis) that's really something.
Really?