If those under eighteen become a reservoir of covid infection,
they might possibly infect their parents, grandparents, their teachers and neighbours.
Although it might seem wrong to forcibly inject teenagers against their will, teenagers do not make electricity, gas, water and sewers run, they do not operate the trains, buses, they do not work in slaughterhouses, they do not trawl the seas for fish and they do not man the hospitals.
Society cannot function without working adults.