It's just fluff the watchtower spew out. The real reason elders are there is to safeguard the org from any litigation, Unpaid, unqualified lawyers if you will. I had a "shepherding visit" one time and this elder told me that not only do they look after the welfare of the congregation, also they have to protect against lawsuits. At the time, I shrugged that comment off thinking that cannot happen often, not in gods clean organisation! Now, that is a comment that actually sticks with me because it does reflect the role they have in the congregation.
There are some who become elders blindly thinking he wants to help the flock, more often than not this type of person usually steps down due to disillusionment.Then there is the power crazy person who relishes lording it over the flock. These are the ones that never step down and more than likely the kind of elder you are describing.