The phrase "moral rot" refers to a decline in moral values or principles. It suggests a decay or corruption of one's ethical beliefs and behaviors. Full definition
Hunted balances its cheesy dialogue and gratuitous sex and violence with an overarching narrative that dramatizes endemic moral rot and the dark money pulling strings from behind the curtain. (metacritic.com)
He's suggesting that, for those who internalize the pain of these offenses, the comparatively innocent whiteness of someone like Doris Day looks like nothing less than an emblem of moral rot. (filmcomment.com)
A shocking turn of events causes Reverend Toller to take on Michael's ideals and missions as he begins to notice the increasing moral rot surrounding him and as his body deteriorates. (filmcomment.com)