Poor people used clone meat.
Rich people wanted fresh alien meat.
Now that I said it, doesn't it seem obvious?
If you look at the duplication of B'Elanna in Faces, it's also pretty obvious that that's the same technology/principle employed by the schism in Deadlock. Either the schism was reverse engineered into technology, or the schism wasn't a natural event but a portable trap, a spacemine, one of thousands they had laying about all over unclaimed space.
Think about it.
If there were thousands of these schisms all over the derelict provinces neighbouring Vidiian controlled space, that means that the hunting parties could take untold numbers of ships and crews, billions of people, and there would be no evidence of those harvested aliens being taken, because every taken traveller still arrived at their final destination despite being unknowingly doubled and sent to a meat packing factory for public dissemination.
If billions of poor Vidiians and hundreds of thousands of rich Vidiians are afflicted, the lost (undoubled) ships are going to stack up and become noticeable to even the most clueless space detective tying to figure out if they need to tell some one up the ladder that it's time to go on a war footing.
100s, even thousands of captured aliens is not going to make a dent in Vidiia's diseased population.
...
There was an air of drama that seemed to reflect that every one still allowed to walk in the open on Vidiia still looked like a Vidiian and that the full effects Phage was being suppressed to the public, or at least the idiots that don't want to take notice.
Only the symptomatic were evicted from the home world in a frenzy to cannibalize any alien they ran across?
Maybe Vidiia admits that the harvesting is happening to their friends, but these horrible things that are happening has nothing to do with the official government and the official government cannot stop it and cannot be blamed for the endless harvesting of the space lanes. Which sound's just like what Pakistan and a few other places might have said about terrorism once or twice.
This was an allegory for AIDS of course?