Vaccine Injury is a real thing (and the DoJ has a compensation program: https://www.justice.gov/civil/vicp)
It's baked into the formulas and data models and there is an acceptable % that will be tolerated, as with anything within a law of large numbers. Nothing is 100% safe.
That is why it's pretty weird when people act hostile to those who don't want to just blindly take new vaccines created in a rush, especially if they are in a low-risk profile (e.g. your risk of being vaccine injured is higher than dying of Covid, in this case if you are a young, active, healthy person). Especially when the companies that created the vaccines waive any legal responsibility to any adverse effects or issues that can happen to you (e.g. you can't sue Pfizer if your loved one draws a short straw and is one of the extremely low percentage of people who die from vaccine complications).
Edit to add: for clarity, I personally did take the two doses of the vaccination as mandated by my employer, gambling that the probability is in my favor that I would not have complications. That said I have empathy for those who made a different, personal decision.