>>96885782
Yeah in a lot of other settings (I won't say 'any other setting' since 40k isn't even that grimdark by the standards of many other settings desu) the Tau would be bad guys. They're an expansionist, collectivist empire that actively assimilates the cultures they absorb (through conquest or diplomacy) into the greater empire, using the unique talents of each race in service of the empire. They're almost like a less dark version of the Combine in that way.
Really, another anon put it best. The Tau are orthodox fascists (before the racism stuff was added) with Japanese aesthetics and NATO military doctrine.