When you have fatigue, imbalanced rostering, or, favouritism in an operation, its called mismanagement.
The same people who call for others to file reports, are generally the cowards who don't. Or who are in a position to be unaffected by the circumstances.
You are damned right not to send in reports if it may mean that you may be singled out for repercussion. There are lots of jobs around nowadays for experienced drivers. Its the level of pain you are willing to endure in this part of the world.