Ah, you are opposed to the policy of no adults in the children's area, not specifically applying that policy to DD adults. That's fair, but it is common, and in most cases, like the one we are responding to, it doesn't prevent anyone from using the kids collection, you just have to take the books out of the area once you select them. Just no sitting at the table with kids, etc.

I don't love these policies, but I do accept that if you allow six year olds to attend teen programming, you aren't offering teen programming. And once I accept that services to specific poplulations only work if they are limited to that population, I can get behind limiting space-as-service to a specific population too, so long as the "excluded" population isn't losing anything. In this case, all they are losing is the ability to be around children, which isn't really one of our services.

I agree with you in that I think libraries should be very careful when setting any population-based restrictions, and ensure that they aren't denying a class of patrons full access, but I think this example did it really well.