I don't think he is stupid or a liar. I think he is a person trying to do something good. He has been made to believe there is evil in the world and probably that minorities contain that evil. He is desperately trying to wake us up to that terrible evil he sees. He sees only the good and the evil not understanding that he was made into a bigot by what he has experienced and confused with reality. If you have been forced to believe that somebody is evil, either because they have treated you badly and you generalize about some feature they have, or you were told they are evil by somebody whose love and support you depend on to survive, you will buy into the notion that those traits and that evil go together. You become a bigot, but the real underlying intention is good, to protect the self and others from evil. A bigot deserves only pity and understanding for what they have lived through that has twisted them up, but an eye has to be kept open to the fact that their demented mental state is also potentially dangerous. You will, however, never convince a bigot that he is a bigot because his sights are set on his intentions, to save us from evil, but an evil that does not exist as imagined.