I agree it’s quite easy to deceive human mind, and that it is forgetful and misconstrues reality.
That is why we have scientific method in place, to take the human bias out of the equation.
Einstein’s general relativity and quantum mechanics is established not because someone said so, but because it precisely predicts the outcome of established facts and not yet observed phenomenon. 
For instance, general relativity predicted bending of light during solar eclipse and presence of gravitational waves that was experimentally validated later.