It is worth noting that the benefits of the vaccine far outweigh the risks, regardless of uncertainty of its longer term impacts, which you note later in the article. I observed that this article places focus on the adverse event of anaphylaxis, something that is understandably scary, especially coming from one with a shellfish allergy who has had reactions like that requiring emergent care. Such a reaction is exceedingly rare and better put in perspective of knowing that while statistically 1 in 1 million would possibly have the reaction (which can reasonably be foreseen and more effectively treated based on an individual's medical history) or 21 out of 2 million as you cite here, 999,999 people of my one million and 1,999,979 of your two million will likely not and have not had the reaction. If others are interested in another perspective towards this which was curated in a physician led publication on Medium, you can refer to my article here: https://medium.com/beingwell/medicine-simplified-covid-19-vaccines-d98ede555e58 .