Here is an example of when well intentioned laws are misused by authorities. In 2003, I believe, Texas passed a law prohibiting unauthorized photography inside locker rooms, dressing rooms, etc. The law was so vaguely written however, that soon, prosecutors began extending the scope of the original law to "catch" perverts in public taking "questionable" photos.
In 2005, in Southlake, Texas, a very affluent suburb of Dallas, Lewis Vogel was arrested for shooting innapropriate photos at an Octoberfest celebration in the town square. Several ladies at the event noticed him shooting photos of, what they said were young girls. The ladies approached a couple of police officers and told them about it. They asked Vogel if they could see the pictures. He showed the photos to them and they promptly arrested him and confiscated the camera.
The Southlake police department held a press conference a few hours later detailing the arrest of Vogel to the media. That evening, Vogel's name and photo was played on every evening TV newscast. Vogel had no prior criminal record. Not even a ticket. Nothing. He explained to the authorities that he was testing out his new camera and he had shot several photos of pretty girls in the crowd, as well as other things happening at the event.
Vogel was released on bail. A few days later, another press conference was held in which a city attorney announced that all charges against Vogel had been dropped and an official apology was made to Vogel. The attorney said, that after reviewing the photos, there was absolutely nothing illegal about his activity.
Of course, the damage to Vogel's reputation had been done. I believe that Vogel later filed a multi-million dollar lawsuit against the City of Southlake.
This is what happens when you have vaguely written laws and then ask the police to enforce these laws. A lot of times, publicity seeking politicians pass band-aid type laws instead of dealing responsibly with the real problem.
These are the kind of laws that worry me, and they are popping up all over the country.