I feel your pain. Daycare illnesses are frustrating. However, kids getting sick at daycare/school is par for the course. Most of the time the kid has already been contagious before they show visible signs of being sick. By then it's too late, anyway.
Realistically a person cannot take 3 weeks off of work & keep their job, because the virus is POSSIBLY still in their child's body, and after the doctor has cleared the kid to back to daycare. It's just not feasible. Just like you are worried about having to take time off of work for a month, so are all the other parents.
I get your concern, I really do, but working parents have to work, obviously, and sometimes that means taking your kids back to daycare before the suggested or proposed/possible duration of the illness/virus. Think of how long a cold lingers. You are not contagious for the majority of that time, though.
It's a virus, not even curable by any medication. The "disease" dramatics are a little much, IMO. Your kids aren't even sick, so I'm not sure why you're so upset, honestly. You're getting upset over something that may or may not happen.