I'd be interested to hear of experiences from any instructors who have come to the conclusion a student is not fit, attitude or skill-wise, to pilot an aircraft, and will most likely be a danger to others if they pursue their training to solo level or beyond.
How have instructors gone about dealing with such a situation if it arises.
In researching / reflecting on this question I've come across food for thought in the following article. Perhaps someone could comment on the themes therein.
http://www.avweb.com/news/columns/182666-1.html