"Denialism is the term used to describe the position of governments, political parties, business groups, interest groups, or individuals who reject propositions on which a scientific or scholarly consensus exists. Such groups and individuals are said to be engaging in denialism when they seek to influence policy processes and outcomes by using rhetorical tactics to give the appearance of argument or legitimate debate, when in actuality there is none. The term was first used in the sense of 'holocaust denialism', but the usage has broadened to include AIDS denialism, climate change denialism, and evolution denialism."AIDS denialism actively propagates myths, misconceptions, and misinformation to distort and refute reality. Denialism is the outright rejection of science and medicine. It involves actively contradicting and disregarding medical advice. It is steady state. Denialism is not open to criticism, and evades modification. Denialism is only open to additional evidence supporting its tenets and such evidence most often comes from the misuse of science and from pseudoscience. AIDS denialists, often for the sake of personal preservation or recognition, hold fast to old ideas in the face of new evidence.
One feature of denialism is the tendency to think of the denialist position as beleaguered, and under attack and in a minority that has to stave off the assaults of the vast wrong-thinking majority. As a consequence, those involved in denialism often, in the other justifications for their position, declare their strong allegiance to the principle of free speech. Interestingly, then, denialists often set themselves up as plucky underdogs, battling for their right to speak the truth against a tide of misinformation and, as often as not, conspiracies aimed at keeping them silent.