Really? Can you give me one example of any bans that have ever worked?
From Prohibition to bans on drugs and guns, bans do nothing but provide a lucrative trade for criminal element and put whatever is being banned into precisely the wrong hands. Why should breed bans be any different?
Murder is also banned, but that's never stopped anyone.
If you would think about this logically, you would see that BSL is not the answer. It merely hurts responsible people, and will not stop the irresponsible and criminal type.