The COVID vaccine has been a hot topic of discussion since before we ever found one. COVID was unlike anything we've ever seen in the modern era and health professionals were in a rush to pump out a vaccine to get things back to normal. They were able to come up with a vaccine to get us back to normal life but some people questioned if a vaccine could be made that quickly and be trustworthy. Many people came up with conspiracies that the government was controlling through the vaccine. The National Library of Medicine dove into some of these conspiracies and proved every one of them wrong. “We identified 637 COVID-19 vaccine-related items: 91% were rumors and 9% were conspiracy theories from 52 countries. Of the 578 rumors, 36% were related to vaccine development, availability, and access, 20% related to morbidity and mortality, 8% to safety, efficacy, and acceptance, and the rest were other categories. Of the 637 items, 5% (30/) were true, 83% (528/637) were false, 10% (66/637) were misleading, and 2% (13/637) were exaggerated.” The mayo clinic also phrased it nicely “Misinformation is often a mix of true and false ideas. COVID-19 myths are no different. As new information comes out, not everyone learns about it at the same time. And a person may not know something they learned is false or may not remember it exactly.”
My conclusion is that people reacted poorly to the vaccine because we've never seen one made so quickly but we've also never had the technology like we do today. It's easier to create new medicines and it's even easier to spread misinformation with social media.