Quote Originally Posted by Absimiliard View Post
Based on context present in Shadowbringers I like to believe maybe he didn't necessarily want to bring about so much death and destruction. [snip]

We can only speculate as to what might have happened had the Warrior of Light proven strong enough to contain and control that light I grant, but if what we've seen so far in ShB so far is to be believed, it's entirely possible Emet-Selch would've proven far more amicable than people realize.
There isn't anything from the game to support that. In fact:

Alphinaud: What was your true purpose in approaching us?

Emet-Selch: By your Twelve, boy, have I not told you before that everything I said was the truth? You were specimens by which I might gauge man's potential as it stands. I genuinely had an interest in you. Genuinely considered taking you on as allies. Provided [he/she] could contain and control the Light. If not then [he/she] - and by extension you - would be of no use to me...

Thancred: [...] But even had we fulfilled your conditions, there was no guarantee that we would cooperate. What then?

Emet-Selch: Then I simply kill you all. At the very least, it would restore the world to the way it was before you went about trouncing Lightwardens willy-nilly.
I still think his plan was weird, but will settle for having my head canon just be that he had a soft spot for who WoL used to be.