Sometimes they have no choice but compromise to pay their bills.
As a side note: Some do get complacent and don't bother looking anymore, after a while. Stress, fear of rejection, repeated failure being some of the things that bring them down. One needs close to an Iron Will to push ahead.
This is America. There are choices. One of them is to choose to upgrade your job skills so you can get a better job. Or upgrade your negotiating skills. Or look at another of the 37,000,000 businesses in the US to choose from. Or start your own business.
The "no choice" thing is just an excuse.
Let me tell you, you can make a lot of money (I do), and still have empathy for the situations of others. Believe it or not, regardless of what your libertarian / conservative media tells you, folks are generally working hard and trying their best. Anything else is outrage porn.
Some people will take a low paid job or crazy hours to stall for time until they finish a course or to save money for one. I did that back in the day too. That is why, at least some, I can't blame.
You are right on the second part though. Some people don't want or can't be bothered to try... and some or just tired of it. Either of these categories I don't defend in any way.