From personal experience, when you're working 2 jobs and raising 3 kids and spend every waking moment worried you can't pay your bills or that you suck as a parent because you're not around enough, taking time to research candidates feels impossible. Which is right where some like to keep us.
I'm in a better place now and have the time to do the work to make better decisions, but it still feels like an uphill battle against the multitude of the uninformed.
The place I was in at the time, it was a struggle to convince myself that I should shower more than once a week and not cry over how I was going to find the money to buy my kids socks. When life is that stressful and depressing, it's hard to see and to take on more issues than what you're already trying to overcome on a day to day basis.
Again, I used to think that people in power couldn't be that evil, but now moving past that place I can see how keeping people down, under pressure, and uneducated really does benefit certain groups.