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You could pivot to many things, for example this FDA approved drug that was later retracted:

https://www.fda.gov/drugs/postmarket-drug-safety-information...

Or point out that the 737 MAX had approval from another federal agency.

We simple can't be sure, it is personal risk management. Requiring the vaccine is silly because vaccinated people can still spread it (especially Delta), perhaps even spread it more since their symptoms aren't as severe and they are far more willing to mix with large crowds.