And perhaps your misunderstanding of how this works is also partly responsible for your suspicion of a cover up. If you think that each new case needs to be investigated in order to understand what’s happening, then you’d expect the government to be very interested in each new case. The reason they’re not as interested as you’d like isn’t because of a cover up. It’s because the science has already been done. Many times. At some point, you’re just wasting your time and money investigating something that’s already been proven incorrect. The government doesn’t want to hear about it if you suspect that you were cured by bloodletting, either. That’s not because of a cover up. It’s because the science has been done already.
