Good Dog - Bad Dog

I am recently reminded, by stories in the papers and blogland, about a story or parable I have heard repeated many a time in evangelical churches. You may know it... the one about the good dog and the bad dog inside us all. Pointing to the capacity of good and evil within the heart of everyone. The line that the church preaches on this subject is simply: The dominant dog will be the one that you feed the most. i.e if you feed bad dog most it will dominate. If you feed good dog most then the good dog will dominate.
Recently after rethinking most things church, I began to think about the idea of the starving dog. This viewpoint seems to be grossly overlooked by the simple feed the good dog or feed the bad dog line.
A starved dog if you have ever seen one is as you could imagine a very formidable beast. Getting more and more nasty the hungrier it becomes. Not necessarily weaker as the Church viewpoint suggests but more dangerous and difficult to deal with.
So following this idea through and applying it to the heart I am wondering if this church line is a healthy one. Does it clearly portray the human heart for what it is? Does it allow for the hearts capacity for evil or does it try to deny it? Does it portray a false idea that all evil can be expelled from the heart by our own action?
I suggest that this simplistic line of thinking is denying the reality of the heart and its impulses toward evil, even for the most 'good' or 'Godly' person. I also suggest that the more a person denies these impulses within themselves the more susceptible they become to such impulses.
So by continually pushing a simple line of: starving the evil dog within; are churches unwittingly forming a culture of denial. A dangerous denial for the capacity for evil and thereby turning a blind eye to it. Much like dropping ones guard, or dropping the armour as portrayed vividly in Romans.
When I read recently about Mike Guglielmucci and his very public and shameful fall from a high place in Australia's AOG ministry. I guess I should not be surprised. I believe the system of church has pushed a small group of hierachy into such an unrealisic pressured lifestyle of perfectionism and 'Godliness' that those chosen few come to a point of desperation that they would do anything to maintain the facade. Under this light the unthinkable acts like: faking disease and; forming a facade of supernatural healing, become understandable and remind me that they are human afterall. I feel that I would be more connected to Mike now that he's 'back on Earth' with us rather than previously when he was cramped into a supernatural and unrealistic lifestyle. A life that he had to lie about just to keep up the lofty expectencies of those around him.
The real shame of all this is that really good people with the best of intentions are continually eaten up by these systems. It's this (church) system that I despise most. I don't think Jesus' idea for his Church looked anything remotely like the systems we have in place these days.
Thank Christ there are movements and leanings to alternatives!