Why does interlaced video have vertical black bars?

Despite looking all over the internet and asking video editors I know, I've never yet found a satisfactory answer to this question:
When I bring DV PAL footage into my Mac, why are there always very thin black vertical bars on each side? And why is the image being squeezed slightly?
I think it may have something to do with interlacing.
If you look at my screenshot here.
You can see that the top image (QuickTime 7 Player) exhibits the issue I'm talking about (the prescene of combing on the man shows this is interlaced).
But the black bars have disappeared in the bottom image (QuickTIme Player X) - and you can see that it looks slightly horizontally stretched by comparison. I'm guessing this is something to do with the fact that QuickTime Player X DE-interlaces video.
The question remains though... what is it about interlacing that introduces black bars and an incorrect aspect ratio??

If you are ripping "standard" format content (4x3 ratio) then it will just appear like that on a widescreen TV. You shouldn't have that problem if you're ripping widescreen content (16x9 ratio).

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Why does interlaced video have vertical black bars?

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