I think it's more of a role-reversal thing. While yes, the previous statements make sense and work, the actual lyrics imply more of the reversal of roles rather than the perpetration of the roles already in place. If it was talking about just defending against an attack, then it wouldn't be so explicit. The reference to little red riding hood sort of implies how innocence is changed by knowledge / experience, and eventually, once your views on the world change, you look for the things that intend you harm, and try to remove them from your lives.
I think it's more of a role-reversal thing. While yes, the previous statements make sense and work, the actual lyrics imply more of the reversal of roles rather than the perpetration of the roles already in place. If it was talking about just defending against an attack, then it wouldn't be so explicit. The reference to little red riding hood sort of implies how innocence is changed by knowledge / experience, and eventually, once your views on the world change, you look for the things that intend you harm, and try to remove them from your lives.