Was Amazon being a patent troll patenting single-click-to-purchase? Was Apple a troll in patenting Swipe to Unlock? They were using those patents in their products.
On the other hand is the Tolkien Estate patent trolls? They're not producing anything new.)
If I have a dozen patents, and some company wants to buy them from me, is that any different to me selling my company? Surely I can sell my assets?
The root issue are not "patent trolls". Being sued by Amazon is no less disruptive than by Trolls r US.
The root issue is the nature of the patents being issued.
The root of copyright issues are (mostly) not about actual copyright, but the length of copyright.