[stonetools]

OK, I'm going to pass over whether you established that independent studies actually supported your specific claim.

Of course, that's all a bit irrelevant. I've never actually said there's no impact on piracy. I've always maintained that piracy is mainly the result of under-served customers by entertainment industries that are having trouble keeping pace with technology change. Piracy is a problem (the extent of which is highly debatable as show by the study you quote), but I don't necessarily think intrusive laws are the right answer; legislation in general is a heavy hammer, and shouldn't be the go-to response for every problem.

I find it strange that you think that legislation and law enforcement has no place in a response to what after all are violations of the law . IP rights are , after all, PROPERTY RIGHTS: and when my property rights are violated, (say if I am burglarized)I call for a police officer (what do you do?).
The Obama Administration in its SOPA response, had this to say , on piracy and the need for legislation:

Let us be clear—online piracy is a real problem that harms the American economy, threatens jobs for significant numbers of middle class workers and hurts some of our nation's most creative and innovative companies and entrepreneurs. It harms everyone from struggling artists to production crews, and from startup social media companies to large movie studios. While we are strongly committed to the vigorous enforcement of intellectual property rights, existing tools are not strong enough to root out the worst online pirates beyond our borders. That is why the Administration calls on all sides to work together to pass sound legislation this year that provides prosecutors and rights holders new legal tools to combat online piracy originating beyond U.S. borders while staying true to the principles outlined above in this response. We should never let criminals hide behind a hollow embrace of legitimate American values.

This is not just a matter for legislation. We expect and encourage all private parties, including both content creators and Internet platform providers working together, to adopt voluntary measures and best practices to reduce online piracy.

LINK

Now in agreement with you it calls for more than just law enforcement and legislation. But it does say new legislation is needed.
As to the study you cited, here is another lawyer 's response , from the same source:

Some point to the 400+ page Media Piracy in Emerging Economies report, released in 2011 by the Social Science Research Council and funded by the Ford Foundation, as providing evidence that enforcement “doesn’t work.” But that’s not what the report concludes, as the editor of the report itself, Joe Karaganis, pointed out in a Torrentfreak article last week:

We talk about the efficacy of enforcement at some length in our Media Piracy report. Many readers have concluded that enforcement doesn’t work. But that isn’t what we say. We say, rather, that we’ve found no evidence that it has worked.

It’s also important to note what the report researchers looked at to come to that conclusion: the research was primarily qualitative rather than quantitative, relying on interviews, focus groups, and analysis of media reporting.

That said, this is but one study. Other researchers have found evidence that enforcement has led to increases in legal purchases of music.

In a paper released last week, Dr. George Barker of Australian National University analyzed the data from a 2006 Industry Canada survey to conclude that “P2P downloads have strong negative effects on legitimate music purchases” and “stronger copyright laws would substantially increase music purchases and music industry sales revenues.”

These findings are confirmed by another recent study by four economists from Wellesley College and Carnegie Mellon University, which determined that France’s graduated response program (Hadopi) caused “iTunes song and album sales to increase by 22.5% and 25% respectively relative to” countries in a control group that hadn’t enacted graduated response programs.

You are right that it shouldn't be the only response , or even the first response. That said, we are 15 years into the era of mass Internet piracy. Clearly, something legal needs to be done.