Nope. Patents and trade secrets help produce things, but they're not required
Yes, however I'd argue that patents trolls are worse than leeches. And obscenely long copyright extension is entirely counter-productive. And you must also prove that patents and copyrights being sold as a product, in the form they are right now, is actually beneficial to society. IMHO, they're currently detrimental to progress. I'd like to think that giving up our rights (which is what we do to provide copyright and patents) should give us back something, not stop progress.