I honestly can't think of any songs that said such daft things as "short hair made (anyone) a baby killer, uniforms were only worn by fascists". I can't imagine singing rubbish like that, any more than a song that suggested that terrorists never had crew cuts and never wore uniforms. It's what you do that matters, not how you look.

"You have discussed this with how many of those who were in uniform then?" Only on the Mudcat (not many US veterans around in this part of the world). And till now I've never come across anyone who has actually said they experienced it.
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There's a saying "If you didn't laugh you'd cry" that applies here. I think there's reason to celebrate the fact that this atrocity didn't come off, and express defiance at those who would do this kind of thing, and this song expresses that.

There's room for other responses as well, including regret at the futile tragedy and misdirected idealism. But that'd be another song. I wrote one once like that, about a young Irishman who was killed when the bomb he was carrying went off prematurely back in 1996.