Those who favor the positive dog training methods such as clicker are also usually familier with the work by Karen Pryor and her followers, so they have a certain idea why they want to train their dogs the way they do. They also know that these positive methods work not only for teaching tricks, but also for working on everyday situations in which we'd like our dogs to behave other than they behave, for example not pulling on the leash, not barking excessively etc. If they've really delved into the subject, they know also that positive methods have been successfully used to help cases of aggressiveness.