I think the reason people don't really care about stealing software or mp3's is because none of this stuff is physical.
If I steal a car, someone looses their expensive investment. With software, I don't actually STEAL anything, I only make a copy of it for myself. There is no loss of physical property.
Just like many people, I don't give 2 sh!ts about stealing software. I haven't downloaded a pirated game or warez application in a pretty long time, but I still have a few things on my system.
Nero 5.5
CloneCD (I don't know why I keep this cause my burner cant even copy new games anyway)
Photoshop 6
WinDVD 3
WS_FTP 6
JMP IN 4 (Statistics software for school)
Diskeeper
Speeddisk 5
HD Tache
Partition Magic 6
Powerstrip
Window Blinds
Thats all the stolen stuff I have (as well as ~2000 MP3's). I don't feel bad for using this stuff. I paid $200 for my DVD drive. Why pay another $80 just to buy software to actually view my DVD's when I can do it for free.
btw, its only illegal if you get caught.