Isn't it nice to be patent troll in the US.

You can threaten 1000's of entities with legal action to extort money, since just defending against the allegation is very expensive. Then when a few of those threats don't stick, all you have to do is "settle for nothing" to avoid an actual trial. Nice.

The patent trolls are just a symptom, the legal system is the problem.

You leave a legal loophole and you'll find some parasitic scum that will exploit it. Personally I find it hard to believe that the people running these companies can sleep at night... But that is a different story.