Neither of their philosophies are acceptable given the body count they require to accomplish their end goals.Well?
I got to wonder what the death tally was for those following the Vorlons?
With the Shadows they made you fight other people until you were the strongest or dead, but the Vorlons killed you themselves if you did not rise to the occasion or live up to their expectations, after they set undefined weird goals.
In either case, their success criteria was to create immortals.
Their failure contingency was to wipe the board and make room for younger races when a species (the Narn and Centauri according to JMS) do not transcend into Gods, or it starts to look unlikely.
Immortal species take up less room.
Who gets to determine if their Vermin? The Shadows, the Vorlons?60 trillion mortal Narn, 10 million years after they first go into space, sprawling across 3/4s the galaxy are vermin, but 60 x 2 million year old immortal Narn living on one moon celebrating 10 million years of Narn History sounds dreadful and you wonder why they don't kill themselves?
I call BS, the Narn are a Sentient & Sapient Bi-PaB {Bi-(Pedal & Brachial)oids} species.
They have every right to live as mortals or immortals.
So what if they spread across the Galaxy, Space is INCREDIBLY LARGE!
Let them spread, they are people just like you & I are people.