It's not a practical issue. It's a political and potentially a legal issue.
It's easy to manage from a practical standpoint. The players and people that age in general aren't going to be socially isolated or in a bubble. So the incremental risk they are being exposed to is pretty minor. Just pull people out as they test positive and the people they were in close, in door contact with. This is going to require teams do things like film sessions and potentially weight sessions a little differently to avoid putting too much of their team at risk of sitting out. You'll have some teams that get pretty thin at times and you may even have a team forfeit a game if they get really unlucky with spread, but that's manageable.
It's the perception/political issues and maybe legal issues that are difficult, and withstanding the histrionics when there are positive tests and an athlete eventually gets seriously sick (which will probably happen, if not in the SEC at least in one of the P5 conferences, assuming they all play). The reality is that the risk was incremental and to the extent they catch covid from a football practice or game, it's still most likely just changing the time that they get sick. But logic and reasonable risk management doesn't play well with the public when COVID is involved, and who knows what litigation could look like. State schools may have statutory protection. The private schools may be exposed to a lot of legal costs even if the chances of an adverse verdict are small.
Good post.
I think there is a path to playing football, but I don't yet see it.