In fairness, you could be out shooting breezers and leave a trail of dead hitchikers down the Freeway....
Seriously though, I wouldn't discount the style of music out of hand for subconsciously affecting the assumption of what the words actually were, it's not really a question of 'turning it into something it's not' so much as the fact that the brain responds in specific ways to specific audio stimuli. Maybe the image that rap has also played a subconscious role, I wouldn't discount that entirely either, but the real point is, I could use 'I don't like Mondays' by the BoomTown Rats on my phone and no-one would probably stop to think it was about an actual school shooting, but it's done in a 'pop' style an is considered a classic.