In part there's a desire to tell people that we have "a cure" or "a vaccine" ready to go because it suppresses panic and anxiety by creating the impression that

In part there's a desire to tell people that we have "a cure" or "a vaccine" ready to go because it suppresses panic and anxiety by creating the impression that the problem is solved. Naturally, telling people that before it's actually true causes new problems, so now we have people fighting to combat misinformation.