Well dark eldar do have a reason, to preserve their race aswell, they give souls to slanesh to not kill them
dark eldar are not good not by a long stretch
Back on Topic....
Everybody has a reason for what they do. The most neutral race out of them all has to be the orks as they just live to fight and fight live. Actually i can't call them evil or good for they probably can't understand the concept themselves.....
yeah that is a pretty good argument
uuhhhmmmm..... it is the Tau they are completely immune to the effects of chaos the are soley dedicated to their leaders is what the Imperial Guard should be but Tau are c'mon "The Greater Good" plus they are kinda sissys they might give you a hug in the battle field or if they bump you they will say sorry then shoot you lolz .... :) uhhmmm.... also the Dark Eldar are not good got that but also they are Eldar themselves just consumed by the power of the warp.... :( foolish Eldar not wise at all
Red Dog - TAU concept of "greater good" which is litterally -> "better for us". They are making world better, for themselves. - Their complete lunacy about their concept means that they will stop at nothing to achieve it, and would rather die then see it fall. - They are VERY naive and lets face it, inexperienced when it comes to the "communications". It will pass in time, but for now, its just how it is.
In the end, we get the perfect recipe for disaster. Tell a TAU that you will help him on his quest for Tau'Va and they'll jump in bed with you. Daemons do not need to posses TAU to manipulate them, they just have to offer there help. TAU do not have prejudice towards Chaos more then they have towards Tyranids or Orks. They will hardly see the "ethical" difference Between a Tyranid and a Possessed. Both look weird, both are trying to eat them. However, this also means that they won't see a difference between a possessed Gue'la Commander and a Normal one. Both are surrendering which means both... Just because Chaos like to wear skulls and weird symbols, doesn't mean TAU would be offended by it. Kroot eat there victims right in middle of a battle field... and yet TAU hire them.
I can fully agree with this.