The Real Hustle
"Tampering with people's PCs to illustrate the botnet risk is unethical in much the same way that breaking into homes to dramatise the risks of burglary is also a non-starter."
As I recall, the BBC Three programme 'The Real Hustle' had their tame grifters hook people's house keys through their letterbox, use these to unlock the front door then put them back with a note warning the homeowner of what they'd done. Assuming this wasn't faked, it would seem the has a habit of committing crimes in the public interest...