Piracy is not stealing. It's copyright infringement. Stealing by definition includes depriving somebody of something. You are not depriving someone of profits by pirating unless you would have bought their product in the first place, and that isn't just an excuse.
Look at the music world - people are pirating more music than ever, but sales are actually going up. Why? Piracy gets bands more mindshare, and people like physical CDs, album art, etc. The RIAA is making a big fuss and suing lots of people, but it's all a load of bull. Piracy makes them tons of money.
This isn't exclusive to music. If Adobe lost money for every copy pirated, do you think they would still be in business? It's fairly common for amateur graphic designers to pirate Photoshop, make money, then buy the real thing with the profits, and piracy completely enforces its position as "the" standard for graphic design. Or do you think it would be better for them if everybody was using GIMP instead? Microsoft benefits largely in the same way. Can you imagine if all of China was using some other operating system, like Linux? Bye bye monopoly.
Yes, alot of time piracy is a bad thing. You could even say that's the default, at least when it comes to software. However, the world is not nearly as black and white as you guys are making it out to be, and you really should stop making such blanket statements. Copying without permission is not the same as stealing. It denies the owner of potential profits, but stealing does both that AND takes away something they had previously had. They are by definition completely different things. It's so easy to call piracy stealing and say it's the end of the discussion but it's also completely fallacious. Look at the big picture.
Disclaimer: I use legal Windows and the GIMP.