totally logical. my go to was asking "covid is in the flu/cold family of virus, yes?" most would agree, and follow up with something like "but we have no vaccine or completely effective treatment for either of them and we've been working on them for decades, so how can you come up with a vaccine in under a year for a virus that's been around for two years at best and KNOW that its effective and/or safe?" most responses were the thousand yard stare because there is literally no way to refute that chain of logic.