Let me try to explain it this way; I don't smoke. I think people shouldn't smoke, but IF they do we have to consider a lot of factors before we judge them, right? Does their smoking affect other people? Does it have an adverse effect on their budget? etc. etc. Maybe it makes sense if I present it kind of like that?

"it can ruin the integrity of the IP or reputation of the artist, depending on where it is sold, what it is sold on, or what it is sold with."

That is exactly the kind of factor I'm talking about. I agree! something like that can happen! but in situations (let's say LJ icons since people seem to be paying attention to that example) where MAYBE unauthorized use isn't really hurting anyone, MAYBE we shouldn't get too too upset about it.