Why doesn't Quicktime Support MPEG-2 with AC3 sound?

Last summer I bought a Mac Mini so I could use iMovie and iDVD to convert and edit my 20 year old VHS tapes of family events to DVDs. This Christmas I got a Samsung DVD Recorer-VCR unit that easily copies VHS to DVD in MPEG-2 format with AC3 sound.
So, I'm all set to use my Mac Mini and begin my family archives project - or so I thouhgt. I found that Quicktime and iMovie don't read MPEG-2!! Then I was relieved to find that there is a plug-in that works with Quicktime Pro that will read MPEG-2. I spent the $50 to download these 2 programs and sure enough Quikcktime Pro will now read the MPEG-2 files from my Samsung unit. However, there is no sound!!!
Is Apple purposely making it impossible to do what I'm trying to do?
Why doesn't Quicktime or iMovie support MPEG-2 with AC3 sound?
Is there some other sound format that is normally used with MPEG-2?
Why would someone create software that reads movie files but doesn'rt read the sound that goes with them?
If I can't hear my little girl sing on these movies, then this whole project is a big waste of time and money!!
I hope someone from Apple can give me some answers.
A frustrated father,
R. Leifield

FWIW, MPEG is a distribution format, not an editing format. The best way would be to convert VHS to DV, edit it in iMovie and burn THAT to DVDs.
Sure, MPEG is a nice compressed format taking much less space than DV but the compression takes away quality.
IMO the best approach with MPEG source would be to edit (yes, it CAN be edited) it with apps like MPEG Streamclip (very limited editing features) or Capty MPEG Edit EX (more features) and author the edited MPEGs via apps like Toast, DVDSP, Capty MPEG Edit, Sizzle etc. THEN you won't lose any quality (unless some of the GOPs have to be re-encoded, that is).
BTW, unlike QT Player, MPEG Streamclip can play also AC3 or PCM audio in MPEG files.
See also:
http://www.sjoki.uta.fi/~shmhav/SVCDon_a_Macintosh.html#edit_convertMPEG

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