I have listened to folks rambling on about medical conspiracies all my life - I think some people just do not understand how very large the medical/biological research communities really are. They seem to think just a few dozen people get together and decide how the world medical communities think - not that there are literally hundreds and hundreds of thousands of biochemists, biophysicists, microbiologists, virologists, chemists, biologists, botanists, physicians, veterinarians, nurses, molecular biologists, and pharmacologists scattered across almost every country on the planet -
Convincing this large group of a new fact is not easy - That many trained hard scientists tend to be pretty demanding of proofs. That does not mean they all agree about everything 100% either - real truth can be difficult to determine in the biological sciences, and there certainly are respectable differences of opinion. And some few may resist new information for their own pecuiary reasons.
But whether Corona viruses can cause disease, or whether vaccines have saved millions of lives over the last century, simply are not questions with unknown or debateable answers.
The vaccinations for rabies, polio, smallpox, anthrax, measles, mumps, are truly miraculous. People really did die from all those diseases, prior to vaccination.
One small example ..... I have been reading Albert Richardson's book "The Secret Service, the Field, the Dungeon, and the Escape (Original and Unabridged Content) " published 1865, about his experiences being held in a Confederate prison in the Civil War. While he was imprisoned in Salisbury Prison, his wife who was safely living in New York, contracted measles, which rapidly progressed to measles encephalitus, and within 10 days she was dead at less than 30 years of age.. He almost died in that Confederate prison when he learned of his wife's death, from grief.
Reading about Pasteur's research, in Wasik and Murphy's book "Rabid", to create the rabies vaccine is truly unbelievable. He would use a glass pipette held in his mouth, while his associates restrained a highly rabid dog, to gather a precious drop of canine saliva from the rabid dog's mouth, fully aware that if he broke the pipette, sucked too hard, or was bitten, he would certainly die the same miserable death that the dog before him was experiencing. One of his fellow researchers DID die of lab aquired rabies. The courage that must have taken is truly awe inspiring. There was NO DOUBT in their minds whether what they were doing entailed any risk. Rabies was, and still is today, a lethal disease without vaccination and treatment.