It just makes sense to have an away bay - it is more fun to sit with your peers and make noise than being a lone voice in a crowd. Nothing about segregating dangerous opposing groups in that - just a better gameday experience for visitors.Correct me if i am wrong, but all clubs have away bays in the A league and probably every league in the world.
Then again, some countries ban all away supporters.
Most clubs have moved the away bays to one of the corners to maintain the home ground advantage and limit their impact on players - that is also commonsense to me.