We got our “explanation”
"See that wreck out there? Mjne are a people born of wreckage and ruin. The exodar on argus. The genedar on draenor.
The exodar on azeroth.
And each time the light preserves us.
Not all of us, just a fraction.
Just enough to continue.
But i wonder if there might be another way. Not in opposition to the light, but along side it. You asked me earlier why i am here.
This is my answer.
Because i survived the wreckage of my people and i am determined to become stronger for it."
(Typed out quest text)