In experienced hands, even a prong (or pinch) collar can be humanely used. Not to get too political, it's a little like blaming the gun for the fact that somebody used it.
I agree 100%. I just wish they weren't sold at pet stores for the average owner to buy. At the training facility I work at, whenever a prong is used, the owner gets a free, mandatory, 30 - 60 minute private lesson on how to introduce it to the dog and how to use it appropriately. We also are selective about which owners are allowed to use them (I've allowed 2 owners to use prongs in 5 years of coaching - I've removed them from probably 50+ dogs because they were either unnecessary or detrimental). If the owner or dog is temperamental or reactive, the prong is off limits.
This article caused me to engage in some serious thinking. I've started Bela on clicker training and targeting and she works beautifully with it, as little as I have taught her. But I can't see where the clicker will help with anything except the association of the click with a delayed reward.
Think of the "click" as a snapshot in time of the perfect behaviour. For example, if I want my dog to focus on me despite increasing distractions, I click when my dog makes eye contact. I gradually ramp up the level of distractions, until my dog can ignore everything going on around him (including people, dogs, treats, toys, loud noises, bouncing balls, vehicles, etc.) because he knows the behaviour I'm looking for. Clicker works because it tells you dog what you want, as opposed to what you don't want. Negatives (ie. don't pull, don't look at the other dog, don't jump on people) tend to be very difficult to understand, so clicker training identifies behaviours you want (walk beside my leg, focus on me, sit when people approach). As time goes by, you will be able to lose the clicker because the dog knows the expected behaviour. However, whenever I am doing any type of precision work or introducing a new trick, I always use the clicker because it's the fastest way of identifying a desired behaviour, and it makes training much faster.
If you're looking for a good resource who uses positive training, check out kikopup on Youtube. She's a great resource for people who don't have good trainers in their area or are unable to attend classes.