That's a nice platitude you've got there. Too bad it means basically nothing.

It actually does mean something, which is that freedom is not unlimited. Your freedom of action ends at the point where it harms someone else. Classically, "your right to throw your fist ends at my face." It's the same reason (legally) you can't point a firearm at me.

What we have here is the problem that merely by breathing around someone, you can cause them harm. Unfortunately we lack the ability to determine whether or not you will, but given the contagiousness of this disease if you are infected (or become infected) it is quite likely.