I personally think the argument regarding tail damage is irrational considering that dogs such as setters are not docked, nor are many working springers.
Why dock show-cockers destined for pet or show (ie not working) homes? I don't see the point really in subjecting the puppy to pain and going to the expense of docking simply for cosmetic reasons.
My cocker spaniel is docked and I really hate the fact someone chopped off his lovely tail
This is why I would only choose a non-docked puppy if I chose to get a pup.
It might be a matter of opinion. But I don't feel that we have the right as humans to chop off parts of our dogs! And incidentally, no I don't agree with circumcision either, unless for proven health reasons.