First line Manager are not selected on the basis of hard skills in their area of expertise. Instead they are selected on a perception of management "fit". These "soft-skill" first line managers are often given responsibility for areas in which they have only limited first-hand experience.
Accountability is limited. The projects are long enough and the teams are big enough that a savvy employee can avoid accountability and many times take or be given substantial credit for other's efforts or shift responsibility for his/her own failures. If you make an alliance with people in the layers of above, it's easy for them to give you a disproportionate amount of credit or shield you from your failures.