OK - technology is what it is, and it is very easy to make a copy of a cd from a friend, from P2P networks, etc. That said - just because it's easy, doesn't make it right. When I pass a supermarket after closing and I see plants sitting outside, I don't grab one and put it in the trunk of the car. I could, but I don't. If you walked onto a car dealer's lot, and found no one was looking, the keys were in all the ignitions, would you drive off the lot in a car? I'm sure some would say yes, but I think most would say no. So why is the stealing of music and movies any different?
I do think that the ability to listen to a cd prior to purchasing is a great thing, so if copying is done for that reason, awesome. But too many people never purchase a cd - ever. Some are proud of this. If you chose to do this, that's cool - but don't fool yourself into saying you're fighting the establishment or some other bullshit argument; it's theft, pure and simple.