One of the most shocking aspects of the murders of Tia Sharp and April Jones is the fact that it takes two child homicides for politicians and commentators to unite in calling for more stringent policing of online pornography. Stuart Hazell and Mark Bridger had both downloaded copious images of sexual depravity involving children, and both men viewed this material before committing murder. I will leave criminologists to discuss what creates such killers, but there can be no doubt that child pornography fuelled their warped desire: just ask the experts at the NSPCC.