There's nothing new about "Misunderstood 'patriotic' songs for the Fourth of July." Consider "Born in the U.S.A.," "Fortunate Son," "This Land is Your Land," "Rockin' in the Free World," and "American Woman." "Yet, many of the classic songs that casual listeners may assume to be patriotic are anything but, from misunderstood anti-war missives to singalong favorites masking darker meanings."
Nothing really new, either. Are you only familiar with the hero's welcome "When Johnny Comes Marching Home Again?" There's another version, in which Johnny hasn't an arm and hasn't a leg, and his sweetheart fears his dancin' days are done, ending "Johnny, we hardly knew ye," that perhaps based on an earlier song. Then there's that favorite for bringing on the fireworks, Tchaikovsky's 1812 Overture, originally written as a celebration of Imperial Russian power.