Dear X,
This is not rocket science. If my friend (now questionable) went to a website where he shouldn't, or my machine breaks down and needs repair so that a techie can see or find files, who will be responsible? I can even erase the simple stuff (temp files, cache, etc.) but he is younger than I, and as such, a bit more savy. So your reply is in error and bad taste.
Terpam