Group-Serving Bias
Group-Serving Bias is the human tendency to consistently attribute a group's successes to its own efforts, and to attribute failures to outside interference. This can be seen in business settings where credit for success is given to employee efforts, successful advertising, etc., but where failures are instantly attributed to outside "sabotage" from competitors rather than examining possible internal factors. This can also be seen in families, and even ethnic groups, where success is seen as completely internal (without taking outside support into consideration) and where a "the world is against us" mentality consistently blames the outside world for all failures.