Here is a study that's an interesting read, Panic Policy Making: Canine Breed Bans in Canada & the US by Susan Hunter and Richard A. Brisbin Jr.
http://www.polsci.wvu.edu/faculty/BRISBIN/Papers/2007.%20Panic%20Policy%20Making.pdf
I kind of like the title. That's exactly how it happens: Hype, panic, bad law to 'protect the public'. There are several examples in history of this being the method of passing laws, the US Patriot Act, a reactive law made in the heat of the moment, in hindsight is viewed as overly intrusive by many Americans. I digress.
I found it interesting to read the background to the Ontario law, even though it is information already known to me. Give it a read. Then, as always, I ask you to please donate. Tell people. Get the message out that this is a bad law that needs to be changed.