Wisconsin IS following the rules which literally give Wisconsin the option to decide whether to play or not. By not playing though, Wisconsin also has to follow the rule of not having any in-person contact for 7 days.
We can say the B1G rules are dumb, but Wisconsin is following them.
It can actually get better in 10 days because by isolating the players, the chain of infection can be broken. But if you want to argue it should be 14 days, then I won't argue that. However, it's ridiculous in the extreme for Wisconsin to cancel all their games.
If they choose not to isolate, then the spread will get worse and Wisconsin will miss more games.