Here is the thing (and that's something that people with kids might relate to) -- we already know that covid is not a danger to kids, and that there are potential side effects involved when vaccinating kids. There is no way in hell I would vaccinate my child because "it is good for the society as a whole".
covid absolutely is a danger to kids, it's just less of a danger than to old people. the question is whether risk of vaccination is significantly less than risk of covid. we don't really know yet, but i'd surely vaccinate my kids if it meant they couldn't transmit the disease to their grandparents.