It is true that far fewer under 17s get the virus, but there are contradicting opinions as to why. Most people who get the virus don’t spread it and many people who get it spread it to a lot of people. Because schools did close first and children are mobile at their parents’ discretion, children had less opportunity to contract the virus and far far less opportunity to become super-spreaders. So we don’t really know for sure.
The opening of colleges is absolutely ludicrous.
(There is a paywall for the full article but it amounts to all the principals needing to quarantine because a contagious person came to the meeting about reopening schools.)