User blog comment:CrimsonShogun/Omega DLC (and Nyreen!)/@comment-4973403-20121112183951/@comment-1221773-20121114030215

Not sure how the Reaper invasion would affect Omega's population since Cerberus controls Omega, unless you're implying that the station's inhabitants fled en masse to avoid the Reapers (which assumes that Cerberus didn't stand in the way of such an exodus).

I also don't think that the Adjutant attack and Cerberus occupation could have made too much of a dent. The Adjutants were taken care of fairly quickly (implying they never had the chance to build-up their numbers to uncontainable levels, and thus relatively few people were infected), and since they went out of their way to ensure they had live hosts to infect, overall casualties were likely minimal. The Cerberus occupation appeared to be more costly for Cerberus than Omega's natives at the beginning, but once Aria was forced into exile, I expect that Petrovsky worked out how to co-exist relatively peacefully with the natives because he's a person of some morals who would try to avoid outright exterminating them.

So, all in all, I'd be surprised if Omega's non-Cerberus population is anywhere near zero.

But that's all going off on a tangent. The original post here was questioning Omega's importance to the galactic war effort. In response to that, all we need to do is wait for the DLC to release and then we'll know why Omega is worth recapturing.