If you're still here: As far as I can tell, emphasising how to take advantage of a bad situation can be useful, but a tendency to downplay the bad side of a situation reduces objectivity by making it hard to percieve the bad side of a situation. Of course you should try to turn such experiences to your advantage (often- sometimes it's better to 'cut and run', and sometimes to try and minimise losses. In some situations it would be necessary to try and avert a greater castatrophe), but objective awareness of the extent of the problem is useful.

In addition, mistakes can be minimised (for some people in some areas of life, they are reducable to insignificance). It is best if a person can recognise a mistake, figure out what they did wrong, and be sure not to do it again.