Committing crime to prevent crime is not legal. This guy should be arrested for monitoring (at least) 3,000 people who happened to have downloaded the trojan he wrote.

Dubbed “Citizen Tipster” by police, Brad Willman, spent night after night writing a Trojan Horse program that gave him complete control over every computer that downloaded it.

Alone and in the dark, he sat for up to 16 hours a day monitoring hundreds of targets, secretly reading their e-mail and tracking their every step online.

He started keeping files on the targeted users. He tracked them for almost three years —recording everything. The majority of his targets were ordinary people — but some in the files included priests, social workers, soldiers, police officers and justice officials.

Mr. Willman should also be put behind bars even despite discovering a few serious child predators. I guarantee that you would too if you were reading every single email, IM, and downloading files from 3,000+ people.