Pandora's box, or jar, as it was in the earliest versions like in Hesiod, contained all the evils of humanity. That is, disease, work, death, et cetera. Once Pandora had opened the jar out of curiosity, they all flew out and befell humanity. As she was closing the jar, all that was left, slightly below the lid, was hope.
Why was hope in the jar?
Hope is sinister in its own way.
>>2550301
Hope is a commodity that's often found wanting.
T. Thucydides.
>>2550307
This, it can make you complasent if you just sit down and think "Oh, someone else will just fix it eventually".
Hope is the most evil thing there is and it only exists if there is evil in the world.
BAP.