I believe I understand what you are saying, Carl, and I don't disagree that the police may be reluctant to file charges against the 6th grade boys, although they clearly committed a misdemeanor offense under Penal Code 647(j). They may also have committed a hate crime, this based on recent California cases that have argued exactly that in cases of bullying.
Although you said that the police "will be hard pressed to find a crime here aside from PC 647 (j)" and you said that the state is not likely to prosecute "if a crime can even be articulated," the crime is easily articulated.
PC 647 states that "Every person who commits any of the following acts is guilty of disorderly conduct, a misdemeanor:
647 (j)(1) "Any person who looks through a hole or opening into, or otherwise views, by means of any instrumentality, including but not limited to a periscope, a telescope, binoculars, camera, motion picture camera or camcorder, the interior of a bedroom, bathroom, changing room, fitting room, dressing room, or tanning booth, or the interior of any other area in which the occupant has a reasonable expectation of privacy, with the intent to invade the privacy of a person or persons inside..."
647 (j)(3)(A) "Any person who uses a concealed camcorder, motion picture camera, or photographic camera of any type, to secretly videotape,film, photograph, or record by electronic means, another identifiable person who may be in a state of full or partial undress, for the purpose of viewing the body of, or the undergarments worn by that other person, without the consent or knowledge of that other person, in the interior of a bedroom, bathroom....or the interior of any other area in which that other person has a reasonable expectation of privacy, with the intent to invade the privacy of that other person.
647(j)(3)(B) "Neither of the following is a defense to the crime specified in this paragraph: (ii)The victim was not in a state of full or partial undress."
It is against the law to take photos of individuals in a restroom without their knowledge or consent, this whether the subject is partially undressed or not. It is a criminal invasion of privacy recognized in ALL states. It can also give rise to civil invasion of privacy actions.
In civil invasion of privacy actions, it is the invasion itself that has caused the harm and the injuries are not always tangible ones. Many of the injuries are presumed by the nature of the offense. Damages can be awarded on the emotional distress, humiliation, embarrassment, etc. that has resulted from the privacy invasion.
I can understand the constraints that the school may be under. It is sad, however, if the school policies are such that a misdemeanor crime can only result in a two-day suspension (a slap of the hand and, as you said, Carl, just some time off from school for the boys to play with their electronic gadgets, if the parents consider the offense as you do - as a boys-will-be-boys "teasing").
I can understand that, even if charged by the police with a misdemeanor, a prosecutor may have difficulty proving the twelve-year-olds are old enough to form the requisite intent (although 12-year-olds are not 6-year-olds and these 12-year-olds have been educated on bullying).
With that said, there is not "nothing" that the parents of the videotaped youngster can do. If the actions taken by the school and the police are not deemed adequate by the parents, and their child is suffering fall-out at school from the "prank," there are civil actions that are available to pursue.
(this post is to replace one I tossed off quickly last night)