It is unethical to put children and young people at risk to protect adults. How can it be right to exploit children's willingness to help in this way, when we know that the vaccines do not work, that they neither protect against the spread nor against infection?
Studies show that you almost always develop a natural and permanent immunity after having contracted a Sars-Cov2 virus (covid-19 infection.)
The Covid-19 infection is no more dangerous for children than the flu. In the first half of 2020, no child died with COVID-19 as the underlying cause of death.
Children usually get a very mild Covid infection, if they even notice it. The risk of severe Covid is extremely low.