The word “rare” is covering a lot of ground here.
Compared to many, I'm rich. Compared to many Jeff Bezos is rich. The distance between me and him is so immense that I have less than nothing.
In your comparison, “rare” is covering that distance and saying they’re the same.
The vaccine risk is so many orders of magnitude more rare than the COVID risk, that it might as well not exist.
At this point because we’re not vaccinating enough fast enough, if you’re not vaccinated you will get COVID. Almost definitely. That’s the risk comparison. Will your personal COVID experience when it comes be worse than the vaccine experience. The numbers say COVID will be Bezos worse compared to the vaccine.