Commentary A vaccine that’s deemed safe for some people may not be deemed safe for others. Take the Moderna vaccine, which North American governments endorse for those under 30 years of age. If you’re a 29-year-old Swede, your government decided against authorizing its use as of Dec. 1, continuing a pause it began in early October. Finland has a similar prohibition, while Denmark touts the Moderna vaccine for people over, but not under, 18. Iceland discontinued the use of Moderna altogether. These Scandinavian countries’ authorities fear Moderna causes needless risk of myocarditis in young people, especially in young males and especially after getting the second shot. Their health authorities instead steer people to the low-dose Pfizer vaccine, which provides 30 micrograms of mRNA, the live agent, compared to Moderna’s 100 micrograms. France’s High Authority for Health not only didn’t recommend Moderna for under 30-year-olds, it also removed its recommendation last …