In a sane law system, the existence of a company as a mere "box of patents" without any real product currently or previously on the market would be illegal, and these patent trolls won't exist...
There's a lot of "on paper" companies around the world who actually do produce novel technologies even if they don't themselves create the end product, but instead sell their inventions to other parties.
Why did everybody just accept the idea that what makes a troll is them having no product when the problem is clear the high costs of litigation and low quality of the patents (and the patents selection)?
IBM is the largest and most destructive patent troll around. And all of that is just propaganda designed to make it and other companies like it rich.