You are right about teenagers, but on the other hand not all people are the same. For some reason we’ve decided that they are competent to make those kinds of decisions and to do other things like driving a car. So even though they are not adults, we don’t think of them as children either. There is probably no simple answer to this question, though.
Remember Kim Dotcom? He had a file sharing website and the police raided his house with guns like he was a dangerous criminal. There is a video of it on YouTube.