Companies and people sometimes do shitty things. It isn't always on purpose (misunderstandings, one bad person, etc), and there isn't always a good way to fix it afterwards. I don't condemn people and companies because of this, and there's a tendency to assume this when you see something and work at the company. It can take a while before you start seeing a pattern and accept that it might just be how things are done sometimes and the management is fine with it. If you don't have a lot of options, I think there's a tendency for people to not look closer either on purpose or subconsciously because they might not like what they find, and then they've put themselves in a harder situation, where they must choose between what they believe is right and a hardship.
Sometimes ignorance is bliss, and the human mind is very complex. That's all I'm saying.
I wish we went into this in much more detail in high school when covering economics and ethics (if the school even bothers to teach ethics). It should be a prerequisite in any capitalistic economy (but not only those, it can easily be extended to other things).
I've also worked in industries that I think don't operate very ethically. It's amazing what you can ignore as an outlier because the alternative is uncomfortable or means you have to make a large personal change.