You can choose a ready guide from some celestial voice;
If you choose not to decide you still have made a choice.
But I agree with you - you see what the lyricist (I think it was Peart) meant, but the notion of, as the stanza concludes, "choosing" free will begs the question of whether such a thing is actually possible. Could you be fated to choose free will? That little ripple of logic has caused many a late-night dorm room or faculty lounge discussion. It also helped light Europe on fire during the Reformation.
Oh, and you're right, Parsy is cheating with that Annie Oakley reference (although now that I think about it I don't believe Oakley ever actually shot anybody. Calamity Jane, then). Dagny doesn't actually blow anyone away until the next chapter in a scene more reminiscent of Walter Mitty than James Bond. "He drew his Webley-Vickers..." :-)
Rush (the rock group) was heavily influenced by Ayn Rand, I believe they dedicated one of their albums to her. Their lyrics certainly show it; the song “Trees” comes to mind.