The good (structural, spiritual, or whatever) which someone has spent years (or a lifetime) building is often destroyed within minutes of their departure, sometimes out of lack of understanding of its necessity or benefit, sometimes out of jealousy, sometimes out of simple callous disregard. Sometimes, the good that they have done is personal; they may have been the bulwark of their community or neighborhood with no one to continue in the role.
True evil, on the other hand, tends to collapse if not shared *all the time*, so it usually *has* the structure to persist after its creator has moved on. That's why you see things like huge, culturally corrupt, morally bankrupt and fundamentally abusive organizations (many of them churches) running on for decades, centuries or millennia after their founders have died and their heirs have been removed from the scene.
Or, more simplistically:
Evil tends to be profit-driven, which causes it to be self-supporting, self-promoting and self-perpetuating.
Good tends to require continual support in order to continue; kick out the props, and it often has insufficient structure underpinning it to survive.
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