Generally, pacifist (and many not so pacifist) Christian followings take spiritual metaphor and illustration from the Old Testament when seeing what it has to teach them, without necessarily denying a secondary literal meaning for a limited people group. When preaching verses out of the Old Testament to a congregation on Sunday, the preacher has ample time to explain his context. I don’t think they would want to have to follow The Star Spangled Banner with a cautionary exegesis every time they sing it.
Offering this as an answer, of course, might create trouble for them as it opens them up to the issue of patriotism and acceptance of (some) American ideals that are encapsulated in the song. Anyway, have a nice weekend!