I think some people may be forgetting that evil spirits are very manipulative and so much smarter than we are. After all, they’re fallen angels. They could very well influence someone to fast for an evil cause that the person either 1) believes is good, or 2) believes is evil and wants to slap God in the face.
How often have we heard of people complaining about overpopulation? Some people’s misguided compassion might lead them to believe that they should fast for more abortions of people who would turn out to be a “drain” on society. Unfortunately human life is being very much degraded in the secular world view today.
As mikemck pointed out, the BIble says that the prayers of the unrighteous are an offense to God. And an offense to God is also known as sin. And sin leads to more sin and separates us from God. How could that *not *lead to a negative end result?
Evil influences in the spiritual realm would love to have people “fasting” for evil things just so they can offend God. I’ve heard it said that the devil doesn’t have a creative thought in his head–everything he does is a corruption of something good God has put in place (curses vs. blessings, black masses, misguided vs. true compassion, presumption vs. trust in God, etc.). Why is it so far-fetched that a poor lost soul might feel drawn to fast for abortions?
And by the way, I heard that talk by Fr. Corapi and the lady on the plane said she was a “witch” and not a “Wiccan.” Of course it was something that occured to Archbishop Sheen, and maybe in those days they didn’t refer to themselves as Wiccans as much. But I’ve found that “Wiccan” is usually used to refer to a practitioner of a formal religion, Wicca, while sometimes people break off from the mainstream religious teachings, making their own rules and calling themselves “witches”. Just my observation.