It looks like this is to ensure advertisement reaches all protected categories. Can this mean that one would be forced to advertise in magazines that cater to different audiences? To guarantee a certain subset of the population is covered?
Thinking of facebook like traditional media doesn't really work. If we allow people to choose where they're advertising, by definition they're targeting. It'd be like randomly buying ads in magazines and papers.
At the end of the day, it seems more like landlords intent for targeting is more important than anything and that is where the fault lies.
If you had a building in an area that catered to people speaking a minority language (5%) of the population; can you target speakers of that language or do you have to spend 20x?