The president, however, does not seem able to accept that Brazilians are “vaccine maniacs,” as he scornfully put it. Eighty-two percent of Brazil’s population is immunized with at least one dose, and even most anti-vaxxers dutifully take their jabs. Commitment to vaccines comes in strange places. In Rio de Janeiro, a street vendor selling false vaccination certificates — someone you might expect to be unconcerned about people skipping jabs — strongly scolded a prospective buyer. “The right thing to do is take the vaccine, you hear me?” he said. “You must take the vaccine.”Some countries, to be sure, are coming to different conclusions about the value of vaccinating kids. In Sweden, for example, health officials decided they didn’t see a clear benefit for vaccinating children ages 5 to 11. Mr. Bolsonaro’s main argument, though, is that the death rates don’t justify the effort. Well, according to our Health Ministry, 1,467 children 11 or under have died of Covid-19 — a small fraction of the 632,000 Brazilians who’ve lost their lives, but an unacceptable number all the same.What’s more, vaccination not only prevents suffering among children but also protects the rest of us. Children transmit the virus: As long as they remain vulnerable, so do we all. And right now, amid a record-setting spike of Covid-19 infections, Brazilians are very vulnerable indeed. The unvaccinated are particularly at risk, and they are mostly children. Here in São Paulo, there has been a thousand percent increase in admissions to pediatric intensive care units in the last month.So the start of Brazil’s vaccination campaign for children over 5 was a source of happiness for almost everybody — the president excepted, of course. Most schools will resume in-person classes in February, after the summer break, and it will be a profound relief to see millions of kids partly immunized.My daughter won’t be one of them: She’s still too young to receive her shots. But as a family we’re feeling, for the first time in a while, cautiously optimistic. Mr. Bolsonaro’s efforts to subvert our health system have mostly failed. Each one of the president’s tantrums is a sign of that failure — and, for us, a cause for celebration.