The paranormal suffers from lack of explanation
Paranormal theories tend not to explain how something is happening. Similarly, the zodiac is disbelieved as there's no satifactory explanation of how stars that form a piss-poor resemblence to something else is meant to influence people far more than, say, passing traffic. If someone created such an explanation, it would be at odds with the rest of science. If it wasn't, it would be so complex and convoluted, Occam's Razor would cut it out.
If something can't be explained, such as the placebo effect, then it needs repeatable experiments as evidence. Again, the paranormal has trouble. Admittedly, physics is far better funded but someone needs to go around bending spoons in laboratories around the world.
