In the mind set of the ideologue ideology is pre-eminent over reality. Thus we had aryan science and jewish science, people's science and capitalist science, creation science and evolution science. Truth is a matter of having the right beliefs. Right beliefs will point you to right science. War is Peace.
Freedom is slavery.
Shit is shinola. An advantage of this tactic is that it works even with people who are not true believers. People are accustomed to the expert who sells his opinion to the highest bidder and the expert whose opinions resonate with his ideology.