Not referring specifically to what people are "denying" - it doesn't matter to the argument - pseudoscience as defined by Karl Popper is that you only attempt to confirm your hypothesis rather than attempting to disprove it. If your theory cannot be falsified by any actual event, it is not science.When one looks at the assaults on science, ... deniers... there is no doubt that the fight against the propagation of pseudo scinece is an important one.
If in any field, someone is termed a "denier", loaded with the threat of mediaeval barbarity, threat, exile, punishment, the baying mob, then it is clear that the hypothesis cannot be allowed to be falsified - you couldn't get a more literal example of pseudoscience (if it even deserves the term 'science' in its name at all). I don't think Karl Popper, in those enlightened times a few decades ago, was even thinking along the lines of a mob being raised to deal with anyone who tried to falsify a theory!
He also said:
It would be quite amusing if a theory literally had its name changed as part of the process of rescuing it; making it unfalsifiable!Some genuinely testable theories, when found to be false, are still upheld by their admirers–for example by introducing ad hoc some auxiliary assumption, or by re-interpreting the theory ad hoc in such a way that it escapes refutation. Such a procedure is always possible, but it rescues the theory from refutation only at the price of destroying, or at least lowering, its scientific status.
I suspect you will say that the gravity of a certain issue means that the purity of the 'science' is secondary; it's OK to introduce a mediaeval religious-style threat of punishment to its "deniers". If so, don't go mentioning it at the same time as talking about the importance of fighting pseudoscience! That's completely ridiculous!
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