What percentage of IT people who discover child porn look the other way?
Most workers of any type aren't interested in snooping through people's private things and reporting what may or may not be illicit activity. (Is that topless girl 17 or 18? Are those kids in a bathtub innocent photos of the client's children or something more sinister?) Just like your typical plumber wouldn't ordinarily report that possible meth lab in the basement, your typical computer repair person doesn't want to report suspected copyright violations, irregularities on income tax files, or possible child pornography. I once had a job that involved me working in people's homes and my general rule was mind my own business and get the job done. I think most workers feel the same way.