I'm not against it. It would depend on the breed for me, but I probably would not crop one of my own dogs. Docking I'm all for (dependent on breed)...if I ever ended up looking at another pointer puppy, it would absolutely be docked. I've been on the cusp of having Skye's tail amputated because she gets happy tail now and again (and we are BOTH miserable), and has also injured it a few times. I've seen docking in puppies done and from what I saw, it wasn't a big deal.
I've seen really poorly done crops, and crops that people had no clue how to take care of after (persistent infection). I really think people need to know how to take care of a new crop...