I think art is often used to probe boundaries. If you, personally, have no such boundary, if the boundary it is probing isn't a boundary for you, then it's not going to have much meaning to you. Just as a side note, for that reason, I would also want to know whether flags were a boundary for the curator and the art-makers in the show. I don't know either way. But if it was not, they would not be in a position to make a discerning and heartfelt presentation of the tensions in the flag issue. Ditto for any artist working on a boundary: if it's not an issue for him/her, poking at someone else's boundary is probably not going to be done in an insightful way.