"the potential benefit of vaccination should be weighed against its potential risk."
Yup, I agree, err with what you quoted, but with which you obviously disagree. Even if what you say is true, I’d rather has a rash for a few days than contract polio, smallpox, tetanus, the measles, …
And following your argumentation, every grocery store on the planet would have to close. Just think of all the products that contain egg, yeast, gelatin, etc., not to mention the proverbial chlorine chicken conservative Americans love so much.
And when the UK leaves the EU, Johnson and his ilk will assure that products no longer list their ingredients, arguing that such labels are too complicated for the poor harried producers. (Unless, of course, Mr. English upper class Master Race Jacob Rees-Mogg doesn’t sleep through the vote on the front bench.)