This child-porn-over-Wi-Fi story baffles me from two fronts: From Minnesota, a person (I use the term lightly) in a town north of Saint Paul and east of Minneapolis decided to use free Wi-Fi at a Dunn Brothers coffeeshop to view child pornography. He apparently sat or crouched in an alley or hallway between the cafe and another business.
Here's what mystifies me. First, someone from the business he's crouching near spots him viewing the porn, and instead of calling 911, reports him to the cafe's manager. Then, the cafe manager shoos the guy away instead of calling the police. Only when the man returns three weeks later does the manager call police.
If you ever see someone viewing images of clearly underage individuals engaged in sexual acts or having those acts performed on them, you call the police. There are times when it's unclear whether the images are against the rules of an orderly society in which we protect its weakest members, but I believe with most of this category of pornography, there is a bright line. There's not much subtle child porn, from the reports issued by the police.
The broader issue of whether one should ever look at images of consenting, legal age participants in naked gymnastics in public places is also pretty clear (no).