"moral danger" is a correct and usable phrase in written English.
You can use it to refer to potential harms or risks that come with making certain decisions. For example, "The mayor was warned of the moral danger of repealing the law."
Contemporary social psychology also associates moral goodness (in the form of pro-social behaviour, helping, cooperation) with empathy, while loyalty, obedience and conformity are mainly connected with morality through warnings of their moral danger.
But there is also a moral danger to consider.
When I'm in China, this mental cast poses both financial and moral danger.
He reminds readers, too, of the perceived "moral danger" of stiletto heels.
His last novels show that he felt a moral danger in his hidden life.
Placements of girls were often made to prevent "moral danger" (sexual exploitation).
We believe a stronger comparison can be made between the myth and the moral dangers of employing precision guided munitions and drone technologies to target suspected terrorists.
It shows that our attempts to avoid obvious ethical pitfalls of actions like firebombing may leave us vulnerable to other, more subtle, moral dangers.
But so far the churches have not offered a full-scale critique of either the economic passivity engendered under Communism or the moral dangers posed by market economies.
Virtue is not the absence of vices or the avoidance of moral dangers; virtue is a vivid and separate thing, like pain or a particular smell.
At the same time, he reconsiders love's moral status, acknowledging its moral dangers while arguing that it is, at heart, a moral phenomenon--an emotion that demands empathy and calls us away from excessive self-concern.
