Racism, harassment ,anything that is protected under equal opportunity.
You can bring anyone of these up and they only sweep it under the carpet.
I left 4 times because they pay dirt, especially for all of the problems that place threw at me.
I really liked my coworkers, but calling management a joke would be a compliment.
If you show them that you are a hard worker, they'll work you for every penny that you're worth, even if that means leaving you on three of the worst sets because they fired someone in your 3 way break, and the other person in your break group leaves because they were only there for six hours. And that terrible night wasn't the last time they bent me over, or the first for that matter.
The pay or the stress of being a opporator
Racism and favoritism mostly
Lack of mobility - mobility would be my way to help employees. If you really care it is hard to build a team to combat the inbreeds.