Zto, i think you need to understand the business a little bit better.
A) 99% of all promo copies that are sent out end in a leak. It's an inevitability in the industry, and one that SW knew would happen. It was just a matter of when. Leakers also aren't stupid, and you won't find the identity of the publication responsible, nor can any action be taken against torrent sites or their admins as such.
B) SW are still a relatively unknown band in the metal world. They do no have the luxury of 'buy on name basis' yet, and need all the promotion they can get. That's why promos are sent out. If they were Metallica, they could rely on their name alone to sell the album. They aren't on that level of popularity just yet, so they had to send out promos.
C) Illegal Music Downloads can be more beneficial than harmful in the case of bands like SW. Reiterating on what i said earlier about popularity and promotion, SW need all that they can get. What better way to promote than to have the album readily available to anyone and everyone who can be bothered to click on the link. There are so many metal releases every week, and it's impossible to expect that metal fans have enough money for all of them. While a sample mp3 goes along way, it still doesn't justify the full price of the CD for many. You need to understand that without big label support from someone like Universal or Sony BMG, SW can never become a household name like so many bands are today (even though we all know everything on MTV is shit). The best thing for them is to catch potential fans with leaks and releases, and hope that those people love the material enough to warrant the purchase of a tangible copy. The worst that can happen is that someone who didn't know who SW are, now know, and have had a chance to listen to their music. If they were never going to buy the album in the first place, nothing is lost. Then again, for everyone else, their chances of purchasing the album are significantly higher. I know for a fact that 2 or 3 people i had promoted the album to went and downloaded the leak, and then the very next day ordered the real album. While not every case ends as optimistically as this, i suspect that SW are making more money as a result of the leak than being harmed by it.
While i do not support piracy in any shape or form, i think it would be hugely ignorant to not recognize the potential benefits of it. Personally speaking, the only reason i know, love, and support about 100 metal bands today is because i downloaded their music. Otherwise, i would have had NO exposure to the bands. I completely understand that SW are not happy with the leak, and that it hurt the real fans more than anyone else (especially those impatient ones that couldn't resist), but i think that the case of piracy is not so black and white as many make out.