[superuser]

I think you're missing the point. You can't distinguish between the patent troll and the little guy inventor because their rights are one and the same. A patent troll purchases the right to enforce a patent from an inventor who would otherwise not have the resources to enforce it himself. It is that right, the right granted to the inventor, that is being enforced. Without the patent troll the inventor's rights would get trampled by the large corporations. Hence, the patent troll is defending the small inventor's rights.

The fact that the patent troll is not practicing the invention matters not. There is no requirement that a patent holder practice the patent in order to enforce it. I can assure you the big corporations do not practice all patents they hold and enforce, many just get licensed out - and there's nothing wrong with that. But there also shouldn't be anything wrong with the small inventor doing the same thing, except for him it often requires the help of a patent troll. The patent troll is just doing for the inventor what the big corporations do for themselves, thus leveling the playing field.