Scientism is self-refuting because it can’t be scientifically proven that we should only believe scientific facts, and since scientism isn't a scientifically proven fact it should be rejected. Scientism destroys science because it rejects presuppositions that science relies upon. Science makes several assumptions such as there is an observable universe outside of our minds and that universe behaves in a uniform and repeatable way. These assumptions can’t be scientifically proven true so without the justification of philosophy these assumptions would have no logical merit. Inductive reasoning, which is the epistemological heart of science, can’t be scientifically proven. Inductive reasoning says that events will probably proceed as they have in the past, but there is no way to support this presupposition as events could change at any time. Also, scientism invalidates the mathematics which science relies upon since math can’t be scenically proven. Mathematic proofs such as 2+2=4 are taken to be necessarily true. If scientism invalidates inductive reasoning and mathematics then it destroys the only source of truth that it claims is true. LinkJerry Coyne has written a response to this kind of stuff right here. If nothing else, all reasonable people can agree with Michael Shermer when he says, the scientific method is the best tool ever devised to discriminate between true and false patterns, to distinguish between reality and fantasy, and to detect baloney. Come on now, what's the problem, and more importantly, answer this simple question: What's the alternative?