Happiness needs loss, fulfillment, pain, hunger, boredom, fear and they need to be experiences backed up by both chemical feelings and experiences and memory and they have to be true.
But here's the thing, already the damage is done beyond just some art. I don't mean to diminish art, but frankly, look at how hostile, ugly and inhuman the world outside is in any regular city. Literal death worlds in fantasy 40k settings look more homey, comfortable, fulfilling, and human.