Kennedy's point is wrong and nonsensical. If a study is funded by a company, that must be disclosed. Studies funded by bodies with vested interest, i.e. industry-funded research, are looked at with great skepticism in the scientific community, and with
good reason; food and supplement companies are notorious for this.
There is some top-down pressure within the scientific community (e.g. NIH funding has a big influence on what gets studied), but it is a large, decentralized community by nature. And even if you thought big Pharma was slipping money to NIH to fund certain studies, that still would not have any influence on the outcome of those studies.
And if you think big Pharma is slipping money to the thousands of researchers who have studied the question of link between MMR vaccines and autism, with these researchers spread across many unconnected institutions in this country and abroad, and each of these researchers has up to a dozen students working under them, and all of these individuals are coordinating to massage the results in a certain way to give them the result they needed, and no one ever blows the whistle on that? There are not 1 or 2 people who can be paid off in this situation.
Further, there are academic groups who make it their mission to find academic fraud through statistical analysis (
https://datacolada.org/). These people would have to be paid off, as well.
And not only would thousands of people from different countries, cultures, institutions, etc. from all around the world have to be on the take, they would all have to be malicious actors who do not care that they are covering up a known harm because they are lining their own pocket books.
Kennedy does not "prove" any of his points, he just throws out a lot of conjecture. Anyone with a fundamental working knowledge of how research is performed across the world would immediately recognize how ludicrous his ideas are.
To your point of social media and peer pressure leading to the spreading of lots of stupid ideas, I am on board. All of the stupid "horse paste" talk when some were proposing ivermectin (a commonly used anti-parasitic with demonstrated anti-viral properties) as a COVID treatment did a lot of harm. It shouted down those proposing a reasonable solution (not how science should work), but then when the solution was actually tested experimentally and DID NOT work*, people refused to believe that result because all of the stupid horse-paste talk convinced those people that the whole world is biased. But that does not change how hard it would be to pull of global research fraud on a topic of great public health interest.
*As an aside, the ivermectin as treatment of COVID results are a bit nuanced. I have not dug into the literature lately, but there was some evidence of effectiveness from some studies, and no positive effect in others, and non-trivial risk of negative complications. There is some indication that ivermectin was actually effective in countries that tend to have endemic parasitic worms, and not effective in countries without this issue (parasitic worms are not a common problem in this country). The reasoning being that by treating the parasitic worm (which is what ivermectin is primarily used for), the body was better able to fight the virus. Not sure where that research has gone since I last checked over a year ago.
Also, a null finding does not mean that ivermectin did not work (absence of evidence is not evidence of absence)...just that the study was not well enough controlled to be able to demonstrate whatever small and inconsistent effect ivermectin seemed to be having. In that sense, ivermectin was like most other things that were being tried at the time for COVID...most of them were not showing consistent, positive effect. Luckily, there are now effective treatments available: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9880713/