After being around for a few years reading, then posting - I've realized the usefulness of Trolls.
For 1. They expose what type of person they are.
2. Trolls are very good once you roast them. Many are not able to march up to the WT and give them a piece of our mind. Most regular JW's and the elite, would not turn a hair over the suffering many have endured because of this religion. But a Troll becomes the representative of all that is bad with the WT. So anyone that wants to vent on them can. Who cares if the troll thinks they are the best thing since sliced bread? Roast them for as long as you like.
3. Trolls can be just deluded JW's trying to count time or make points. Still - see above.
4. The inexperienced Troll is good for a laugh.
That is just some of the things I think when I see a Troll. How about you?