I just don't have the time to address all the issues being brought up here, except to say training with treats and using positive rewards does not mean that your dog will never do anything without treats. Many, many agility and working dogs are trained with treats or a favorite toy or some kind of reward. For SOME dogs (it seems especially highly energetic and work-driven dogs), just the work itself is reward. Treat training can be VERY successful and reliable. Clicker training proves that (clicker training and treat training go together.) The key thing here is knowing how to phase treats out and/or make it a more random/occasional reward.

Destructive behavior has nothing to do with getting revenge. A dog that tears up something when you are away isn't doing it because he/she is mad at you and getting back at you, he/she is doing it out of boredom or anxiety or playfulness.

Anyway, here are a few links that explain some things in hopes it may provide some help.

About treat training
http://www.drsfostersmith.com/pic/ar...id=202&aid=181

About clicker training
http://www.clickertraining.com/train...m=what_is_ct_s

Myths about clicker/treat training
http://www.dogschool.co.uk/myths.htm

Placing human emotions on dogs (such as the dog is getting revenge or is mad at me)
http://www.thepetprofessor.com/artic...cle.aspx?id=92