Gods And Evil Gods
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Within the High Heavens, the Gods oversaw the world inside of their flying palaces. Their glowing eyes noticing the descent of a traitor into the body of a vessel she has been preparing for a long time.
It was already seen as a taboo among taboos to descend into the body of a mortal to attempt to change the mortal world, but because Evil Gods had long ago broken their connection with the rest of the gods, they were able to do as they pleased.
And them, enclosed in their own palaces, could simply watch as they did whatever they pleased. They could not afford to waste energy and efforts into stopping their foolishness.
Were they cowards? Perhaps. Did they saw the lives of the mortals below as "not worth the effort"? Most likely.
However, deep down, they knew that eventually, they would have to confront the traitors, and eventually, they would have to fight. Whoever more lives are sacrificed does not matter.