Belief in the face of mountainous evidence to the contrary is the hallmark of a cult. From Thorsteinn Siglaugsson at brownstone.org:

This weekend The Daily Sceptic published two articles reviewing some studies purported to show Covid-19 vaccines are useful for countering so-called long-covid, lingering symptoms after Covid infection. The conclusion of the author, who is an ex-senior scientist with the UK government, is that the vaccinations do not in fact prevent those symptoms.
In addition one of the studies he quotes shows a great increase in health-related problems resulting from vaccination, which the authors seem to have tried to bury.
The interesting thing here is how we have, over the course of 18 months, moved from eagerly awaiting vaccines that would eradicate Covid-19 by providing herd immunity, towards failed attempts at showing that at least those vaccines prevent long-term health issues among those who catch the disease and fall ill with it, the disease they wouldn’t have caught, let alone fallen ill with, had the vaccines worked as promised.
At the same time, more and more data from all over the world show how the vaccine rollout is in fact correlated with a large spike in excess mortality. The only hope seems to be the adenovirus vaccines, the use of which was discontinued in most countries in favour of the mRNA vaccines. That may have been a premature decision, as contrary to the mRNA vaccines, they seem to lower excess mortality.