Its an "Open Secret" as far as I am concerned. The Aun know it, the Earth Caste Higher ups most certainly know about it, as do the Fire Caste Generals most likely. The tau saw they could control the masses of the vespids by having direct control of their "leaders". After all, their lives wouldn't be worth living without the "Greater Good" and if they didn't mind control them, they would have wiped them out, as I doubt they would have allied with them normally (I mean, look at the trouble they have trying, and failing, to keep the Kroot in line). So in a roundabout way, enslaving them is for their own good.
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