Alliterative Asking

Just wanting some opinions: Is it possible as a practicing parent to undo unintentional implicit condonement of potentially perilous or halfway hazardous behaviors without seeming hypothetically hypocritical? Any thoughts on this poorly worded subject?

(In other words, if past actions or omissions might have led to certain behavioral conclusions in your children, reinforced by repetiton or lack of correction, is there any benefit to an abrupt "policy shift" or are there other ways that would be better suited to remove bad or introduce missing good to their teenage minds that might actually work?)

And, yes, I know that there is potential for my or other children to read this note, hence vagueness. :)