We all know that social distancing and wearing masks 100% of the time can't really work in most of our walks of life. There are just too many things where people HAVE to be close to each other: elevators, airplanes, theme parks, sports arenas, the waiting rooms of doctor's office, standing in line at the DMV, going to a Chick Fil-A.
So, yes, even places at 50% capacity means people won't even be close to 6 feet apart. And we NEED to be okay with that. But, at this point, the fear is so large we just can't jump in with both feet without freaking out a lot of people. So governors paving a path to re-open (no matter how risky) is a GOOD thing over governors that feel locking down longer "until its safe".)
The reduced capacity is just simply to help reduce the odds of getting infected in a crowded place AND help people "feel" safe. To help communities feel its okay to start going back to being among other people (which is needed in order for society to function). Once people start getting back out there and doing "normal" things at a reduced capacity, with safety procedures in place (like masks on), then the country as a whole can begin to heal and feel ALMOST as safe going out and about like we ALL do during flu season.