You're using logic and common sense...
Oops, sorry.
The arguments for song-swapping are always the same and read like a Letterman Top 10:
10. It's free, so it's not stealing.
9. Even if it is stealing, it's only stealing from the rich record companies - the artists never see the money.
8. The technology to do it exists, therefore I can.
7. CD's are too expensive.
6. Everybody does it.
5. Copyright law sucks.
4. Record companies suck.
3. Capitalism sucks.
2. I already own the CD.
1. Just try and stop me.