Again: This reveals an ignorance about how trials actually work. You should be more curious.
Clinical trials don't happen "behind closed doors and come out with only a result."
Clinical trials are run independently across hundreds if not thousands of research sites. The people who run these studies do not work for the pharma companies. They do not work with each other. They do not know whether the drugs they're giving each patient is the real drug or the placebo. They therefore have no way to coordinate fraud with each other and actually execute it at a scale required to both change the results and be undetectable (i.e. massive, systematic deviations on top of randomized data that produces something other than just "more noise"). Each of the thousands of people who would need to cooperate in this conspiracy would be risking years in prison, the destruction of their businesses, and the cancelation of their medical licenses... for... literally no benefit? The people actually running these studies (which are not the pharma companies themselves) don't get paid more or less money based on the results!
Every step from initial data entry through to data analysis is auditable and inspected by the FDA. The statistical analysis plan is written prior to any data being collected, and any ad-hoc deviation from the pre-established analysis plan must be defended to the FDA. No "data corrections" can happen once analysis has started without very specific audit and approval by FDA for each individual data correction.
Again: this is a really remarkable system that is a lot of fun to learn about if you have some curiosity. It's not perfect, but it's especially strong at the massive scale of the vaccine trials because there would be so many data points that need to be manipulated by so many independent parties that it's just a ridiculous notion.
Ah, that makes perfect sense.
It is hard for a man to understand something when their salary depends on them not understanding it.