Hadn't heard about this until I read it either - it is shocking, but not unexpected. I think the best thing about it is the stark 'truth' that it presents to people who have until now heard the occasional story and seen the school briefing but never really thought about it.
The offenders are sick, and I agree that such base instincts are mostly simply just 'there' and not a choice - that doesn't make it right, but it does make the existence of these people inevitable. However. This sort of thing should be used to round them up and help them, somehow, before they do some real physical harm to a child in the real world. If they DO harm children in the real world, or cause them to harm themselves, then I am in the chemical castration camp. But not for just attempting to groom online, because...
...it is completely the responsibility of parents to safeguard their children online, just as it is in almost every aspect of their lives. And it is possible. Problems include parents ignoring what their kids are doing, using technology as a way of getting them out of their hair, not wanting to conform or censure their children... Though mostly probably the biggest issue is simple ignorance of the dangers and what parental controls are possible / necessary / actually pretty easy to implement on a PC, tablet or other device.
Tell you an idea that might help - when you order a laptop or PC you answer specific questions about who will use the device, how old they are, what they will use it for, and whether you want restrictions to be applied. Then it is delivered with profiles & a selected internet security product pre-configured, including very straightforward instructions as to what it does and how to work it.
Perhaps the government could provide part funding for a scheme to encourage people to have a local professional check their pc's and set them up properly - protecting children and society as well as stimulating local business....