The CDC finally started publishing stratified data for COVID by age. for the 15-24 age group in the U.S., a total of 225 deaths "with" COVID (that is a loose term). In the same timeframe, more than 16,000 persons in the 15-24 age group have died. so the COVID deaths are 1.4% of the deaths in the age group during that time.
The last year the CDC has published detailed breakdown of deaths by age and cause was for 2018. In that year, for the ages 15-24, nearly 12,500 persons died from unintentional injuries, 6211 from suicides, 4607 from homicides, 1371 from malignant neoplasms (basically cancer), 905 from heart disease, 354 from congenital abnormalities (I don't know what that is exactly), 200 from influenza, 246 from diabetes, then goes down from there. In the unintentional injuries category, individual causes are motor vehicle accidents (6,308), 3,675 from poisoning (I assume that means drug overdoses), 431 from drownings, 152 from falls and then down from there.
https://webappa.cdc.gov/cgi-bin/broker.exe
This data is readily available and took me all of 15 minutes to access. This is not to say that virus isn't serious, it is. Especially for older persons. But colleges and schools should be opened. It is very comparable in terms of impact to seasonal influenza to persons ages 15-24. For those 14 and under, seasonal influenza is much more serious. In 2018, 244 persons in the U.S. 14 or under died from influenza. There have been 45 kids 14 and under who have died from COVID in the entire country.
Just based on the data, it makes zero sense for us to not have schools and colleges open.