Galaxy
I think the lives that people tend to lead without ever having the structure of a job are generally not conducive to good mental health.
I suppose a job represents a purpose in life and of course, a means to earn a living.
But, two things - for those who feel they have no stake in the society in which they live because all that's open to them is menial, dead-end jobs under which their meagre pay will mean an indefinite struggle for the basic necessities - you can kind of see why that structure might become fairly meaningless.
Of course, some will say, "well, they should better themselves and find a more rewarding job". Which is true, but that will depend on their level of education and the opportunities available. It was easier I think in the days before labour deregulation when there were jobs where you could start at the bottom and work your way up. I don't think there are many chances like that now, it's mostly contract work where you have a number of hours working for one company and have to make up the rest of those hours working for another.
The other 'thing' is that even with a good full-time job - one you enjoy that pays relatively well and gives you a good structure to your life - an illness, or a major family 'event' that throws you off kilter, can cause the whole pace of your life into tatters.
That happened to me. I won't go into details, but one moment my life, as a single parent, was balanced - good job, affordable child-care, disposable income, things to look forward to, plans for the future... the next moment it all came crashing down around me, due to an 'event' over which I had little to no control. And for a while (too long) I became one of those 'dependent on benefits'.
Fortunately, the timing of this was during an era and climate where the necessary 'help' was more available, and where there were more opportunities to get back-in-the-saddle. The 'good-life' was still a possibility - all it needed was a bit of effort on my part - and it all seemed well worthwhile. I had secure, rented (and affordable) accommodation in a 'desirable' location; the child-minder had become a friend; my GP was sympathetic (and I could always get an appointment with him); there were a number of relatively well-paid jobs available. Having fallen off the ladder, getting back on it again was comparatively easy.
If that had happened to me today, I think it would be a completely different story / outcome. Times have changed so much, globalisation, the deregulation of the labour market, the shortage of affordable rented accommodation; the paucity of meaningful, well-paid work; have all contributed to a sense of insecurity about all aspects of life where the future simply becomes a matter of 'getting-by' rather than living a structured life.
When I 'fell of the ladder' - I still had hope, today I think I would feel hopeless.