I feel like you're trying to ask a serious question, so I'm going to give you a serious answer. If you just want someone to blindly agree with you, skip this post. No one (well no one intelligent) is claiming that healthy 22 year olds are going to start dropping from Covid. The protocols are in place to try to limit the spread from large events like sports because Covid-19 is very easy to transmit.
Let's use round numbers to create a rough example. UT plays South Carolina and 5 players from SC have the virus. They spread it to 25 guys on their team and 25 guys on UT. Those 50 guys now go back to campuses to visit their girlfriends who all catch it. Those 50 girlfriends take it back to their sorority or dorm and each infect 3 people. We're now at 250 in what could be a single day from just a single game. Obviously those numbers extrapolate out to get much larger very quickly and once you start seeing significantly higher numbers then you inevitably do run into people who are vulnerable to it. If you can limit spread, then you limit the risk to those who are vulnerable.
That makes just protecting the vulnerable people seem like the easiest solution, but we can't really create internment camps for old folks for however long it takes to create a vaccine. Staying home if you feel sick is a good rule to stick to as well, but I believe it has been proven (or hypothesized and not yet proven) that individuals can spread it prior to experiencing symptoms and while asymptomatic. So in a country of 300 million people if you can limit the spread to say 10 million and 1% of that group dies (it is probably lower, but don't make me do real math) then 100,000 people die. If you let it spread to half the population and 150 million people get it with the same mortality rate then you lose 1.5 million people. The protocols are in place so that we can continue to have some more normal things, like sports, while still not being completely reckless about how we spread the disease.
