The proof is in the pudding. The academy has done a pretty good job being in charge of its own house over the past century and a half since the proliferation of the German university model. Not all ideas deserve equal weight - that’s the very essence of a marketplace, whether it’s an I-phone or a scientific hypothesis. You can choose to spin your wheels on whether the world is round or build on the consensus (that it is indeed round) with the hope and expectation that it will conform with reality in the long run. Carefully weighing what is good evidence and what is not is (in part) what we pay good money for universities to do.