What are your thoughts on banning the ownership of dogs such as pit bull terriers?

My question is inspired by this news story from Australia where a toddler has been killed Link

and by my personal knowledge of a guide dog that was recently attacked by a pit bull terrier and had had to have significant treatment is now quite traumatised. The guide dog was just out walking with its owner and the pit bull was in a vehicle with the window open and jumped out to attack the other dog.

Should the ownership and breeding of these dogs be banned?