In the Premiseverse, that side mission happened already, as Liethr points out — it’s why Watson is so fortified now.
The Batarian Empire , however, would not want to antagonize the SA at this point in time given their smaller forces and territory.
Several other side missions in both ME1 and ME2 are handled by Delacor, including the fallout of a certain Dantius.
Purge the alien. Kill the heretic. Suffer not the witch to live.