Pro 24:10-12 If thou faint in the day of adversity, thy strength is small. If thou forbear to deliver them that are drawn unto death, and those that are ready to be slain; If thou sayest, Behold, we knew it not; doth not he that pondereth the heart consider it? and he that keepeth thy soul, doth not he know it? and shall not he render to every man according to his works?
When I read this, I think of notable times in human history when people in general totally failed to do the moral thing. The Holocaust and our current abortion practices come to mind. One day we will all be judged by the God who truly knows how much we knew. It isn't like Watergate where we can lie about how much we knew and when we knew it. We are all called to act in the moment on the wrongs we see. Feigned ignorance is no defense.
"All that is necessary for evil to triumph is for good men to do nothing."