It is because the experts who are balancing risks in the UK (who I trust) say that direct heath risks are about the same down to age 12, and the indirect benefits (carers stay alive, schools stay open, children don't miss schooling) swing the balance to vaccination.
Arguments of a criminal based on the wish to help his mafia friends to sell vaccines.
No healthy child so far died from CoV-19. But the UK mafia now tries to construct some cases by not allowing sections. How many children did already die from the RSV pandemic caused by the vaccine terrorists?? All countries with child mask mandates had overly full youth hospitals with RSV cases...
Only the fascist vaccine terrorists steal the lives of children and treat them WWII concentration camp like.
At least Switzerland had never a stop of "in class schooling" and only masks for age > 12.
But now the Swiss terrorists had to surrender to the international mafia (global vaccine passports rules not accept when Switzerland does not follow..) ...
Thus be aware that FM/R/X/B is a world wide network of fascists (controlling most states) with the sole purpose to suck out as much money as possible. Normal humans are cattle for them just "eatable" meet.