I thought the report a few weeks ago said the individual benefit from the vaccine for kids 12-15 is still greater than the risk (though by a much smaller margine than in adults). Their recommendation was that the difference is small so that they will not recommend it. The decision to allow it then comes from also considering the benefit to others.
With that in mind, I would allow a 12-15yo kid, if I had one, to get the vaccine. It’s still less risky for them than getting ill. (Even if not considering the rest of the society.)