Oh sure, don't ask the person who made the Colony
Well I'll have you know!
The Colony isn't mostly Batarians, which are only a small Percent, most Pirates crews are multi-raced, and 40% of the colony's citizens are human, 15% are Turians, 10% Asari, 10% Batarian, 10% drell, 5% Quarians, 5% Volus, 5% Hanar
And while Slave trade happens on the planet, very few slaves are actually used by the Citizens