Mr. Doomsday

Doomsday, or more often called apocalypse is an event or series of events that results in an end.

Why does this happen? A build up of events years in the making, or is it incited by corrupt people looking to improve something?

My answer is both, the first would a be a keg of gunpowder lying about, where as the latter, the corrupt man would be the match that lights it aflame.
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Author's note: I had an idea after staying awake one too many nights on The SCP Foundation wiki. This is the brain child of that.