What if it was something truly offensive? Propaganda or something? I think that's the source of the outrage. If iTunes can push one album onto your iPhone without your permission, they can push ANY album onto your iPhone without your permission.
As a long time fan of U2, believe me when I say this WAS something truly offensive - the album is the worst collection of songs they have ever released. After listening to the album all the way through twice, I prompty deleted the songs from my iPhone.
You know what they say about "you get what you pay for"? Well clearly there's a reason why this album is being given out for free.