Psycho Sis

I've got a psycho sis, by that i dont mean my minds in bits  Just that ive got a little sis that runs about with knives and shit  Claims she ain't crazy because she doesn't kill kids Just pedophiles and wronguns and others that people want rid  Blights on society, thats it  Shes a saviour a golden soul really, dont you think  ( its all lies i don't even have a sister haha)