Too often, parents assume their child is property that they can and should completely control. Nobody seems to ask what the child wanted. Perhaps there is a reason the child did not talk to the parents about such things. Perhaps the child did not want the parents to know. What rights does the child have to privacy?
My father was like that. He disagreed with who my friends were, the ones I hung out with. He forbade me from hanging out with them, which meant I had to sneak out at night. Then he contacted the school counselor to change my classes so that I would not be in contact with any of them. The counselor refused, then told me about the request. That erupted into a fight (literally a fistfight), and I was moved to a foster home. I ran away and left the state.
Parents believe that they have the child's best interests in mind, but that is not always the case. To allow a parent absolute control without consulting the child's wishes is wrong. If the child is very young and unable to decide for themselves, it makes sense. By high school, they have an idea of the shape they want their life to take.
We are not talking about criminal activity here. That is not the reason the parents could or would have objected.