User blog comment:KrusH HsurK/Earth, Capital of humanity, but lacking of its own capital?/@comment-4310096-20120508211244/@comment-99.1.241.31-20120508214612

The Turians actually consisted of multiple factions until the Unification War (straight from Firefly) where a bunch of colonial factions had it out. This is before Turians became part of the council, so eventually the Hierarchy kicked in and forced all the factions to join the Palaven Hierarchy. It also mentions that the standard Turian procedure for subduing colonies is to create a safe camp, and then go door to door announcing safe haven for colonists/turians who stand down. They then use the "hasastim" as an execution squad for anyone who refuses to cooperate/goes hostile. Even though all Turians go through military training it's still pretty brutal. Hence that was how Turians got a capital.