I mean its their right to decline obviously, but it annoys me when people say things like "I'm waiting for more data". No you aren't. If you were scrutinizing the data, you would have gotten vaccinated. People just say that because its the answer that makes them look less scientifically illiterate. We have tons of data to show this vaccine is safe and highly effective. Unfortunately, some medical workers are more willing to believe Facebook over the New England Journal of Medicine. But they don't want to say that, so they say they are "waiting for more data".
That being said, there are very real reasons why someone may choose not to get vaccinated. I know of someone with anaphylaxis to other past vaccinations who still tried and went into anaphylaxis. Not everyone can get vaccinated. I get that. IDK how you could mandate it for that very reason. In some select group, the risk of the vaccine will be worse.