Sci fi/fantasy elements when applied realistic human nature

When something is invented or discovered, humans will always try to gain from it money, power or sexual pleasure. What are sci fi or fantasy worldbulding tropes that in your opinion would be used in a way darker and depressing way than it's usually depicted. Something like psychic powers creating sex slaves or immortality being charged every year by a subscription.

When we invent teleportation, sending bombs to enemy territory will be one of it's first usages.