A very wise saying. Those who expect a new law to
magically make all that nasty bad behavior disappear fool themselves. You
can change said behavior by several means, but making laws is not one of them. At most, it reenforces the other methods.
Case in point: most guns are obtained legally. Does this mean that if guns were outlawed, criminals would no longer have guns? Of course not. Legally-obtained guns are simply a path of least resistance.
The period of Prohibition in the United States did nothing to prevent people from drinking alcohol, but simply made them seek illegal means of procurement. If people want it bad enough, nothing will stop them.
It is apparent from the War on Drugs that this lesson has not yet been learned. It is even more apparent on countless other issues that this thinking is not limited to governments.
Addendum, June 11 2000:This is the furthest thing from anarchy propaganda, considering this was first said by a Chinese philosopher, making an observation about his government post, if I recall correctly. (I shall node this worthy sometime in the future.) It is a simple statement of fact. If you add a law, you increase the number of actions that are considered "criminal". Thus, you will have more crime, especially if the law restricts a very popular action, or has no discernable good purpose.
In short, there is a difference between anarchy and common sense.