Which one are we talking about again - the moon landing, JFK, 9/11 or covid?
The biggest issue I have with these sorts of conspiracies is whenever you try and scratch at the "why" you'll get a bunch of conflicting answers that are completely unsatisfactory. They are trying to kill off half the population. They are trying to install mind control agents. They are trying to persecute more libertarian minded people by targeting those that refuse to vax. They are trying to make money for the vaccine producing companies.
None of these reasons make any sense for ALL the major health organizations and governments to go along with.
They also fall apart really quickly. One of the conspiracies is that "fauci is making a bunch of money in stocks from his investments in Pfizer and the like". yet, you look at Fauci's financial statements and you see he's invested pretty much entirely into mutual funds and ETFs (poorly I might add). [1] His finances are public record.
[1] https://www.documentcloud.org/documents/7014520-Fauci-Disclo...
Yet it appears to be a perfectly valid theory. https://www.amazon.com/Viral-Search-COVID-19-Matt-Ridley/dp/...
It is not the first time that this has happened. We were told that Irak had weapons of mass destruction. It was announced at the United Nations. All mainstream news agencies reported it.
For many, many years, the US was 'winning the war' in Vietnam. All news agencies agreed. The US was not winning.
The mere fact that many, even most, people agree with something does not make it true.