"No one should have to risk catching this virus ever."
Apparently, that's where some people are on this issue. If that is the mindset, then we certainly can't allow 18+ year olds to volunteer for military service can we? After all, there is a risk of dying in either actual war conflicts or in training. We also can't allow them to go into a career of law enforcement - too dangerous, somebody could get killed. Can't allow people go into fire fighting either since there is a chance of getting killed putting out a fire. Can't allow them to go into construction either - could get killed on a construction site - it happens, doesn't it?
Why don't we simply let people take individual responsibility and make their own decisions for how they want to handle this aspect of life? If you are elderly, have underlying health issues, or simply fearful of catching the virus, take whatever precautions you deem are necessary.
If you are 18-21 years old and you want to play football, why should I tell you "no can't allow it, too risky", but I will pat you on the back if you want to go into the service, law enforcement, or any other risky occupation?
If you are a coach and don't want to take the risk of catching the virus then simply find another way of making a living that will ease your mind. No problem with that - nobody is forcing you to be a football coach.