It wasn't necessarily a bad reaction. It was just a feeling. Things seem to even out. The song may inspire some to kill children, and inspire others to kill those who kill children. While I feel one may be wrong (and I so hate saying this)...that may not be the case.
yeah I don't see that as a real concern. while there is scholarly evidence of a causation between violent media and violent behavior (see, for instance,
this meta-analysis) the results are, to quote that study, "modest". (to be perfectly clear, they said "modest but significant", but in a scientific context "significant" doesn't mean what it means in colloquial speech. it just means "above baseline random noise".) and for adults, the effects are largely short-term: they have their mental patterns and such in place and you can't disrupt them with a simple poke like that. also, generally, violent imagery is more powerful than violent words, because your brain dedicates more of its processing power to vision. further, the song isn't actually, as far as I can tell, all that violent. there's no real explicitly described violent acts beyond the title. it's not like, say, Cake and Sodomy by Marilyn Manson, which I was gonna quote for examples but holy **** you do not want me to quote that song. look up the lyrics (or better yet, listen to it) if you want a point of comparison.
anyway, it's certainly possible that the song is inappropriate for children. children are most susceptible to programming, after all. but the world is already full of material that's inappropriate for children, so I'm willing to put that filtration responsibility on parents. it's not like it's making any attempt to hide the theme.