For the first half of 2021, the mRNA vaccines looked to be near perfect. The trials reported more than 90% efficacy for the Pfizer and Moderna vaccines. Both provided near 100% prevention of severe COVID-19 and after hundreds of millions of adults received the shots, no signal of harm emerged. I, like any rational person, see a positive benefit-harm ratio from the vaccines for adults. Younger People? After a "positive" trial in which just over 1100 kids aged 12 to 15 years received an mRNA vaccine, a movement arose to vaccinate young and old alike. I put "positive" in quotes...