Interesting question. Like I said, trusting or not trusting the FDA approval is not why I haven't gotten the shot yet.
I have personal experience with the FDA's Emergency Use Authorization for KN95 and N95 respirator masks during the pandemic, as an owner in a dental supply business. It's this experience that convinced me the FDA, like just about everything else the government has their hands in, is subject to corruption and/or negligence.
Its a long story, but I'll give you the reader's digest version. The difference between an "FDA Authorized" respirator mask and a "Non-Authorized" mask meant almost nothing to those of us that understood what the product is and what it does. I know higher quality products that were not authorized, and inferior products that were. One day, without any notice, the FDA produced a list of authorized KN95 mask manufacturers. Problem is, only a selected group of mask manufacturers were on this list. I had mask manufacturers who have sold FDA authorized masks in the U.S. for 10 years inform me that they have no idea how the FDA came up with this authorized list, how to get on the list, or how to get their products tested and approved for this new list. Also, there was no way to call someone at the FDA (during this time) to find out. It was a total mess for months.
Ironically, only a small group of mask manufacturers were authorized at first. Of course, it was the same companies who had no inventory to sell to dentists, because they were selling 100% of it to the government. THEN...the government started giving boatloads of cash to manufactures (like Honeywell) to start producing masks. All the while existing respirator masks, ready to be sold, aren't being authorized and the companies have no way to get authorized, or even talk to anyone about it. It was clear, to all of us in the industry, that there was some shady stuff going on here.
All the companies that did not have government contracts were left out of the discussion until it was clear that these manufactures could not able to keep up with demand. Suddenly, after months of not being authorized, companies magically became authorized again. How? With some sort of new mask effectiveness test proving its FDA authorization is warranted? NOPE. One day they only had authorized 13 companies, the next day they had authorized 48 respirator mask manufacturers. With at least two of the manufactures I personally work with, there was no contact with the company, no masks were sent in for testing, no test results shared, and they still were authorized for EUA. This EAU, by the way, was recently removed now that mask inventory is no longer an issue.
I don't know who the FDA directly reports to, or who specifically oversees that agency. What I can conclude from my own experience, there is most likely government contracts going to private companies (like the military industrial complex) that might play a role in decisions being made. Or its just incompetence. Either way, I'm reluctant to trust the FDA 100% because of it.