The 16-25 group has huge numbers right now, but they are at very low risk here. My 16 yr old just had it and it was basically a 3 day cold. My other two college age kids ran through it in September and never checked up. The colleges that opened are in much better shape than those who played it conservatively. For example, my middle son's college was having 600 cases a week right out of the gate on campus, and by November there were only 15 cases per week. Not a single student was hospitalized for COVID all semester. Herd immunity works if under 25, or at least it did for the first strain.