They may injure themselves by persisting in behavior that does not conform to natural laws. The best way yet devised for winnowing the truth from lies and delusion resides with the scientific method. Relying on such instantly and irrevocably removes one from the critical thinking process. There are neither aliens among us nor UFO s. Those claiming to have been abducted by aliens are suffering from some form of delusion.
Faith healers are frauds as are fortune tellers and tele-evangelists.
They all belong in the same category people who exploit people s fears of the unknown for their own ends, benign or evil. They presume to control others, to profit personally from that exploitation, to feed their own sick egos, or even altruistically to provide comfort and hope to suffering people. The list includes but is by no means limited to such figures as Adolph Hitler, Pat Roberts, Oral Roberts, Billy Graham, Al Sharpton, James and Tammy Bakker, and the Iatola Khomeni. Even where the ends might appear benign, the means are reprehensible.