A safe, narrow, predictable job is all that some people are equipped to handle, emotionally or mentally. These jobs tend to be dead-end jobs.
Also, jobs like this tend to be stopping places for people who've worked their way up from a disadvantaged background -- first in their family to graduate from _junior_ college, or even a trade school, that sort of thing. It's hard to claw your way up from absolute bottom. Some people get a certain distance up and stay there -- because it's way so much better than where they came from, and getting any further would take more resources than they currently have.
And then there are the people with drug and alcohol problems who can handle something like this while still having their problem, at least for now. Often these people are capable of much more (and may have done more, at one time), but with their habit all they can handle now is a drab little job that doesn't ask too much, one where you can show up hung over and still do the work because your fingers pretty much know the way by themselves.
And some people just have crappy self-esteem, and think it's what they deserve. There are a million reasons.
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