FDA studies). Boom - no way to measure effectiveness, longevity, etc.
2. potential side effects are not fully known or understood
3. the vaccines are as of now, experimental
4. immunological response of humans varies all over the map
5. I have 99.8% of surviving the virus without the vaccine
6. In time, our species will have herd immunity, despite the government's actions to delay it (distancing, lockdowns, isolation).

I probably don't need more than 6 reasons... Have a nice day MFC