Well in everything that you are going to steal that is against the law and if you don't want to be punished by law then don't steal. But bitcoin doesn't have law at all so I would say it is going to make the stealers or hackers to steal more bitcoins because no law is able to punish them. I think the international organization for bitcoin must create sort of this law.
Even if you suggest to make a law regarding on this stolen bitcoins then i would say it still useless to implement because on the anonymity of bitcoin itself they would really have a hard time to track those bitcoins and anyone could use mixing of their coins which is more a hard thing for them.