I think you mean lazy as in can't be bothered to better their situation?
It's not that easy. Mumsnet always trots out the ' why don't you retrain ' advice for people in crap jobs, but that requires a ceratin level of learning skills, time and money ..a lot of people don't have two of these, let alone all three.
I enjoy my job, It's ethical, and I get treated well by my employers. It's less than £30k a year ( in the North, not so bad) but considering my school life back in the 80's , that's quite an achievement. I'm not an ambitious person and don't like lots of responsibility. I'm a 'work to live person' and not a 'career is everything' person.
Another Mumsnet trope is constantly banging on about your ' pension pot' , which MUST have hundreds of thousands of pounds it. Well, I will be happy with my state pension and a the small amount I will get from my public sector job. I'll be dammed if I'm missing out on stuff and stressing myself out with long hours and pressure now, in order to have a retirement that might not even last that long.
Also, as a poster above has said, sometimes your life circumstances significantly narrows your work options , if you want to earn money to keep a roof over your head and food on the table. You can hate your job, but it can be a necessary evil.