Remember that the threshold shouldn't be "fully safe", the threshold should be "better than the alternatives". If the alternative is COVID, that's a pretty low bar to clear. Given that we may have several vaccines to choose from it's worth a bit of effort to weed out any unsafe ones, but remember that every day of delay may cost thousands of lives.
> If the alternative is COVID, that's a pretty low bar to clear.
It's really not a low bar. A healthy 35-year-old has maybe 0.01% chance of dying, 1% chance of lasting side-effects from Covid. Untested medicines can be way more dangerous than that: thalidomide, for example, has a 50%+ chance of causing stillbirth or birth defects for pregnant women [0].
If you just vaccinate the old and sick, risky vaccines start to look more attractive. But those people also have a greater risk of side effects and are underrepresented in the clinical trials, and most vaccination strategies mooted so far for Covid are based on mass vaccination of healthy people. So it has to be really safe for that to work.
So may every day of rushing. These testing/approval protocols aren't designed simply to provide job security. They were much cheaper and quicker before events like this one: https://en.wikipedia.org/wiki/Thalidomide_scandal
15000 also becomes a much smaller number as you start to consider factors which may change how someone reacts to the vaccine (gender, race, age, preexisting conditions, etc)
