Potential Negative Side Effects of Meditation

Is there a dark side to meditation? Can people experience negative side effects of meditation? Why is the spiritual community so fearful of media exposing situations of armful or negative experiences with meditation or Yoga?  Or What Research Says about Reiki? I for one am not fearful or startled by these experiences or stories. I have known many people whom have experienced harmful or negative side effects of Meditation, Yoga, Reiki, Tai Qi, Qi Gong and most other healing modalities. Why is this a shock? Not all people, bodies, minds and spiritual imprints are the same, why should our experiences be the same? The same would be true for Prayer, who has not had a negative experience praying sometime in their life? Can you honestly say there is anything that you have experienced anything powerful in your life that has been completely free of any negative experiences - sleeping, eating, making love, walking, laughing, relationships, singing, dancing, painting, kissing, medicine, religion, school, hugging, psychotherapy, counseling etc.?...