What if everything we know is upside down?

What if "good" is actually "bad"?
What if "optimism" is actually "pessimism"?
What if "love" is actually "hatred"?
What if "happiness" is actually "sadness"?
What if "hope" is actually "disappointment"?
What if "life" is actually "killing"?
What if "God/Goddess" is actually "Devil"?
Would the world be a "worse" place rather than a "better" place if everything where "upside down"?