The point is regardless of if it's good or not. Removing the rights and privileges of ANY group of humans. Will spread to the rest of us. When you restrict something for children in school it almost always ends up in work places for adults. Because many companies consider the work place little more then school 2.0 when it comes to control. The employee is functioning barely more then a child as far as many companies are concerned
Children deserve rights and respect. If it's a problem you deal with it on a case by case basis. Just as you should in the work place. The sacrifice for freedom and self respect is that some people will try to take advantage of it and abuse it.
Blanket bans in all but the most extreme of cases are only considered smart by assfucks, shit stains, fascists and ignorant fuck muffins who listen to the other groups with out a second thought. And cellphones are NOT a extreme case.
For the rest of us we know how stupid they are and how many knock on problems they cause the rest of us. Or at a minimum ask and question things as to learn why there is a controversy.
So good on you for asking. Props for not being a idiot.