If you have actions and words, then you should judge them based on actions because that is what they did and not what they said. The actions are more important than the words. If they promote peace and love, but spend their evenings violently attacking children, then their actions speak louder than words.
If all you have is words, then you work with what you have. At that point you are responding more to the message they are expressing, not necessarily to them as an individual.