Mr. H, when Macca sings about "preparing to shoot up the city", he's not actually refering to guns as we normally think, but comicbook plasma rays or some such thing. There are pictures of our kid reading X-men comics in the early seventies and V&M has several references to them. Magneto, Titanium Man and the Crimson Dynamo were villians. In Rockshow, he mentions a Mademoiselle Kitty and yes there was a character named Kitty in X-men. In fact that whole spoken bit sounds very comicbooky, doesn't it? Mind you, I don't have any of this information on authority, but I too read those comicbooks way back when and the evidence is overwhelming: Paul was a bit of a nerd, I think.
But your point about the violence is valid.