SueDonim
Children are vaccinated against rubella not because of the illness itself, which can go unnoticed because it’s usually very mild, but to protect pregnant women and their unborn babies.
Yes rubella vaccine is an interesting example but quite a complex one as well compared to the covid vaccine. Firstly, if you get the two standard doses, the immunity should last for life ( we don’t know yet how often we’ll have to have the covid vaccine) and secondly, when it was first introduced it was only given to young girls to protect them in advance from getting rubella in pregnancy. Over time, the limitations of this became apparent and it was combined with MM and given to all children. By this time of course there was a great deal of global clinical data as to its long term safety with children. So there was a great deal of time before it was used across all children and from a very young age.
Just to be clear, I’m not arguing per se against children being vaccinated but suggesting there's an ethical debate to be had before that happens.