Well according to some of my friends, they were my school friends and I'm not proud to know them as friends. They don't believe the vaccine because they believe in something else. They believe that this is just a huge scheme designed to make the rich like Bill Gates to be richer and vaccine is the way to transport money from people, industries and governments to a few ultra rich people to make them richer. Again, Bill Gates included.
And that's not only the limit. The dumber ones then start to make things up even further like covid has never actually existed and the diseases that people talked about are actually flu, sore throat or others that have existed for decades and that the people who died from covid actually died from other terminal diseases but still marked as died because of covid. So by the end of the day they believe in something else, that's why they don't believe in vaccine. Conspiracy theorists are the worst people to convince.
About the effect of vaccine itself, I have seen members of my family and friends that got infected by it months after they got their 2nd shot and they are all now doing well. Most only experienced mild symptoms and the few who had a comorbid successfully recovered. No death which is why I'm very thankful of the vaccine. It works and everyone should take it. If they don't want to, make them pay 500% more taxes or something. We're all in this together and by not taking
free vaccination they put others, including themselves at risks