The argument for vaccines the benefits far outweighs the risk. That doesn't mean that there is zero risk of harm. It does mean that the risk of harm is low enough that the benefits far outweigh them. People who are vaccinated are far less likely to face an early death, or serious complication from disease than people who aren't vaccinated
. That doesn't mean that there aren't a few isolated cases of things going wrong.
It is very easy to find cases on the internet of people doing healthy things that caused paralysis or death in rare cases. My quick google "yoga caused paralysis" yielded several cases. The number of deaths caused by jogging should scare anyone out of stepping out of their house in running shoes.