It might help your case to pick an example other than trotting out the old paedo boogeyman. I can see the point you're making, but there's a red flag for "THINK OF THE CHILDREN!" fear-mongering.
However, it doesn't require much of an imagination to think of other scenarios:
* Keeping records of drug sales on a phone. * Messaging a hitman to carry out a murder. * Recording days and times of homes being empty in preparation for a break in.