Well, in my case, it's because my job is here in the US, not Canada or someplace else, and I can't afford to pull up stakes and haul ass. And I'm damned sure there are tens of millions of others who are in the same (crowded) boat with me.
In fact, when you get right down to it, most people who are working, even though we may FEEL we are free, are slaves to the system just as much as any black person in 1820s Georgia or Alabama or Mississippi or Virginia was a slave to the plantation owner. Maybe they don't actually own us like they do the building, the machinery, the computers, or the ball-point pens on the desks, and they can't sell one of us down the river — but they still have tremendous power to be able to fuck up your life anyway, since they can pretty much hire and fire someone at any time they wish, for whatever reason they wish, and the worker doesn't have Jack Shit to say about it (fuck you very much, 'at-will employment' policies and the union-crippling 'Right to Work' laws).
So you learn pretty damned quickly to do your job, do it as well as you possibly can, keep your mouth shut, don't make waves, and if your employer hands you a shit sandwich you say "Yummy!" and even ask for seconds.
-"BB"-