Vaccine or Not?

The corona virus started in China, very near a place which experimented on such things. We were lucky enough to have scientists who came through with vaccines to counteract this virus.

We now have three effective vaccines which are given out for free but less then half the population of the U.S. is vaccinated. Why is this? Is nature providing us a way to decrease population by giving people the idea that the vaccine is dangerous? Which is more dangerous? Taking the vaccine or not? How many more people will we lose to covid?