Having made a career in law enforcement, I'm compelled to say that the law does make sense. However, sometimes people who INTERPRET the law make no sense.
For instance, if a 30 year old man talks a 14 year old girl into running off with him, you might think he could be charged with contributing to the delinquency of a minor. Right?
Wrong! You must first prove that the minor was delinquent. It is logical that you can't contribute to something that does not exist.
Also, just because something is illegal in one country doesn't mean it should be illegal in another.