Call out the cops . . .
@ TheVogon: You certainly have some odd notions about the role of the police:
"Sure, but I would also expect them to be arrested for assault and criminal damage and the court to order them to pay to fix said damage. They should have called to police to address the original issue..."
They should also have been prepared to wait for, let's say, two to six weeks whilst the police were busy dealing with other unambiguous crimes, after which time a nice community relations officer would've dropped by to say that, amazingly enough, we can't find anything in Law which stops you from blasting to smithereens the means whereby a possible paedophile gets off on viewing under-age children to their inevitable distress.