moral contamination
moral filth

Could you avoid the moral contamination that accompanies power?

Questionable too is the idea of banning investment in Indonesia to avoid moral contamination.

The philanthropists' focus on isolation and moral contamination became the foundation for early penitentiaries in the United States.

Votes for anti-discrimination and throws Lucy out of the house for fear of moral contamination.

He who had palely loitered, fearful of moral contamination, now boisterously stamped through practicalities.

For Swift, there is a connection between cosmetics and prostitution; the carefully assembled exterior often conceals both physical horror and moral contamination.

But contrary to so many depictions of the encroachments of the West on Asia, "Golden Child" does not present Westernization as a moral contamination, a de-purification.

To advocates of both systems, the promise of institutionalization depended upon isolating the prisoner from the moral contamination of society and establishing discipline in him (or, in rarer cases, her).

Watch Tower publications define the "world" as "the mass of mankind apart from Jehovah's approved servants" and teach that it is ruled by Satan and a place of danger and moral contamination.

Jehovah's Witnesses endeavor to remain "separate from the world", which is regarded as a place of moral contamination and under the control of Satan, refusing any political and military activity and limiting social contact with non-Witnesses.

The Communist press railed against "moral filth."

You are a cesspit of moral filth."

Therefore, get rid of all moral filth and the evil that is so prevalent and humbly accept the word planted in you, which can save you.

Josh Marshall of Talking Points Memo recently called out the McCain campaign for its "moral filth", which is not too strong a phrase.