The fundamental difference between ideology and science is that the former asserts what you or someone else would prefer to hear, and the second about what is plausible in his vision, without taking this preference into account. Ideology can never be more than a subjective value judgment, while science must be free from that judgment. Ideology is intended for the masses, who have little or no rational and analytical thinking, science - for intellectuals, for whom this thinking is the main value. The masses will never be able to do genuine science, because no true intellectual can be an ideologue, because any ideological assumption will deprive him of his rational and analytical thinking or significantly reduce it. Free rational thinking based on empirical scientific facts often forces you to go against various common forms of ideology, such as history and religion.