I am not really for nor against it as a whole. Personally. I don't like docking. But I understand why breeders want the right to choose.
But I think to say that a yorkie has the potential to go after a mouse and break their tail and using that as an excuse as to why tail docking is the best option... is like saying "the chance of my yorkie jumping off the couch and breaking it's leg probably will happen in it's life time... so I'm going to amputate it's legs". May be extreme but it's just how I feel. To use what MAY happen as a reason for docking... just seems a bit silly. Lots of things can happen, but we don't prematurely get rid of it. However if a dog is working around vermin all day, as a working dog, then YES I do understand. As the chances are going to much higher for injury than a pet dog.
I can understand why some prefer the look of a docked tail as well. I have no issues with people who have a preference!
I am not sure I necessarily agree with the banning of tail docking... because then what ELSE are they going to control? Ya know? But it still doesn't mean I like it