yeah small note to add here: the last pediatric vaccine (garadasil / HPV) went through a decade of clinical trials before approval
Think about this for a second. If you give 100,000 pre-teens an HPV vaccine, how long do you have to wait to discover if they are more or less likely to contract genital warts? Now compare that to how long you would have to wait to see if they contract COVID. This is not a valid comparison.
The infection rate and how HPV spreads is completely different from an airborne virus. The time comparison to do trials isn't really meaningful.