Most of the doubt can be alleviated if it were enforced that such dialogue must be conducted in good faith by open minds. Bad arguments are so prevalent becaus

Most of the doubt can be alleviated if it were enforced that such dialogue must be conducted in good faith by open minds. Bad arguments are so prevalent because their staunchest peddlers aren't arguing from ignorance alone, but arguing from deep-seated convictions or selfish interests. That is, they violate the criteria of good faith and open mind.