1- it is a vaccine. That argument is ridiculous. No vaccine is 100 percent effective, though this one is close. When it doesn't prevent infection, it reduces severity. They won't claim that it stops community spread because they don't have the data YET (though initial results look promising). It doesn't mean that "everyone will get the virus anyway". 3- the vaccines on the market have completed phase 3 trials BEFORE they were granted an emergency use authorization, and all did well. Read the trial results. They're all public.
