For example if you spend months studying only to fail a course there is no one to blame but you. If you don't study in the first place and blame society, genes or circumstances then you are blameless. You were dealt a bad hand, luck isn't on your side... I'm sure you've spoken and heard these words.
This isn't to say that society, genes or circumstances DON'T effect outcome (in a myriad of complex overlapping ways) but they have become scape goats for many peoples lack of endeavour in life.