Human allies brought there by Tyrael in preparation for the hero because, well, someone's gotta repair your shit, sell you potions and buy all your crap! Really, this is like delving for the greater significance of the Cow Level.
This place has been hallowed by the blood of thousands of champions of the Light, many of whom were mortal, like yourself. Now the final battle against the Prime Evils draws near... and you must face it alone.
It serves as a base for the Angels and their mortal allies in their struggle against the forces of darkness
Also, I thought only Imperius is against the Nephalem. Hope, Fate, Justice were all 'for' with Wisdom abstaining, which counted as 'against.'
D3 Act IV spoiler:
Imperius is also the only one that wants to wreck you up for being in the High Heavens, the other council members, except Malthael of course since he's MIA, and random angels don't seem to care and/or are glad to see you there helping them, since, you know, they were fated to lose that battle.
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Non nobis, Domine, non nobis sed nomini tuo da gloriam.