The thing is man, there are in fact psychics that are the equivalent of thermonuclear ICBMs.
For example, I'm a little old and rusty, but hypothetically, with an 8 minute reaction window, I could concentrate an energy of (conservatively) 300 megatons/minute on a target area of about 3 square miles, or a distributed neural net of of several thousand psychic operators, and could sustain this for maybe half an hour before my brain liquified and ran out my nostrils.