User blog comment:CrimsonShogun/Omega DLC (and Nyreen!)/@comment-4973403-20121112183951/@comment-2250460-20121114031132

The Reaper Invasion may have not had a direct impact, but it would Certainly be a major blow to morale. Additionally, since Cerberus is working under the Reapers it is possible that the Reapers have a presence on Omega.

Anyways, while Petrovski might want to reason, Omega's citizens would be less than willing. Regardless even if there are still some survivors, I don't see what good a bunch of criminals and thugs and small time Mercs could do, Shepard already has the major players working for him.

There has to be another reason why Shepard is doing this.