The chances of the law being successful even if it is passed is in doubt so Jennifer is trying to get a little publicity for herself and if you combine that with having a bad day, you get the photo above. Most of the time Jennifer doesn't say anything to anyone and just lets them take photos. The problem with this law is that every single photographer in California would be subject to prosecution if a kid is in their photograph without the permission of the parents.
Lets say you are in California and throw your child a birthday party and invite all the kids from your child's class to the party. You have the party to end all parties but don't have any photos. Why? If you take a photo of the other kids at the party and don't have the parents' permission to do so you just committed a crime. Going to Disneyland? Don't bring a camera because you might get another kid in a photo that is not your kid and you can go to jail. Kindergarten graduation? I hope you have a good memory or can afford a courtroom sketch artist.
Celebrities only think about themselves. They don't think about how it will affect everyone else in the world. The other thing it would do which I think is great will show which celebrities are on the payroll of paps because they will be the celebrities who always have photos with their kids.