What about speed cameras or red light cameras or toll violation cameras? Those only take pictures of the license plates of people who actually break the law. Are you against those too?
Most people wouldn't want to cause trouble on or near a school bus like that. But if that's the only such bus in the city, the criminals would head to other locations.
Water doesn't work on all fires. If you throw water on burning grease or other flammable liquids, you'll just make the fire bigger and hotter and scarier.