If a person doesn't want to take the vaccine because they're unsure of the long term results, that's fine. I can quite understand that stance.
How is new unknown vaccine more dangerous than new unknown disease? Long term effect of covid infection is not understood either.
mrna vaccines have been researched for more than a decade.
Assuming that everything can have long term effects is stupid, you don't even know how the vaccine works exactly. Could be that it literally cannot have any delayed effects that would magically appear out of nothing after a few years because of biological reasons.
Even if you'd not want to take this "experimental" vaccine you could take a more traditional vaccine soon (or maybe now already) assuming that your country accepts it.
If somebody does not take a vaccine and that results in death and more restrictions, does he really have right to do that? Why would somebody have right to cause death and harm to others just because one believes in conspiracy theories?
And if you don't want to believe in modern medicine in general, then do it properly. If you get infected, stay home, no crooked ventilators, experimental blood thinners or any other kind of treatments. Healthcare should be take it or leave it style of package.