Popper talks about what scientists should do, which is to abandon or modify their theories in the light of conflicting evidence. Kuhn talks about what they do do, which is to keep the existing paradigm as long as they can because their promotion prospects and the respect of their peers are often bound up in it. The new theory often comes in only when they retire and younger, more independent minded people take their place.
Margaret Thatcher faced bitter and entrenched hostility from those on the Tory left because they had spent their political lives on the basis that their purpose was to manage decline and concede just enough socialism to buy off revolution. They hated her for replacing their paradigm by one that stressed enterprise and opportunity, and showing that their political capital had been wasted.
The euro has visibly failed, but those who spent 15 years of their political lives setting it up and maintaining it will not let it go. That would be to admit failure, and they have too much political capital invested in it to abandon the failed paradigm. They would rather see Europe face decades of recession, sluggish economies and astronomical unemployment than give up what they have committed their lives to.
Enthusiastic pro-Europeans in the UK have committed their lives and their future to ever closer political union. They see nation states as an anachronism, a brake on their clean vision of a smoother world. The Europe they dreamed about is long gone, and they refuse to look at the reality of what the EU is now. The EU which the UK joined, and the one it wished Europe to become, is also gone, replaced by a bureaucratic and undemocratic organization in which the wishes of its peoples have to be at best circumvented, and at worst overridden. Fortunately the younger people who have taken their places do not view the paradigm through the same rose-tinted spectacles. The mounting evidence suggests we are at one of those points where the old paradigm is replaced by a new one that better fits the evidence. The old guard will fight to justify their past, but they will lose.
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