The purpose of science is to develop the most efficient possible description of the world, that is: to explain the highest possible amount of natural phenomena with the lowest possible amount of hypothesis. This process requires two phases: one concerned with observing, measuring and describing specific phenomena (the empirical phase), and the other (the rational one) concerned with interpreting, explaining and organizing them into a coherent synthesis, but also to critically scrutinize others' claims. Both these components are absolutely necessary in order to have proper science: a "science" without a rational component is nothing more than a collection of unrelated facts that's in no way better than a caveman's understanding of the world, while a "science" without an empirical component is fantasy or science-fiction, that is: a very elaborate representation of something that doesn't exist.
State Pseudoscience often completely disregards at least one of the two: the most usually disregarded is the rational one, and the reason is simple: while the empirical component often requires very specific means of research that only a selected group of people can have access to, the rational one only requires one's own mind and reason, which can be potentially found in everyone; therefore, using "empirical evidence" as an excuse to dismiss rationality, it is possible to shield the established truths from public critical scrutiny, allowing their promoters to come up with as much unverifiable "evidence" as they want without worrying about contradictions; this, of course, has the effect of destroying the empirical component too, reducing it to nothing more than a propaganda tool.