By definition you wouldn't know many lonely people. The chronically lonely ones are going to be the people who didn't end up getting married when they "should" have, couldn't make it into a proper career or fell out of one at some point. Most upper middle class people won't be lonely since if you can afford a career you can afford a social life or you might even be forced into one. But of course uncertainty and insecurity can make one feel lonely, so I guess that would count. Still that isn't going to be your epidemic. That is going to be those left behind.
> Most upper middle class people won't be lonely since if you can afford a career you can afford a social life or you might even be forced into one.
Social life is not about having money (well unless you're really poor) - it's about having time and people to spend it with. You can be in top 5-10% of income and a total loner - plenty such people in tech.
This makes me think of a good friend from college that I lost touch with, who recently committed suicide. I felt a significant amount of guilt, thinking about the fact that I could have very easily stayed in touch with him, despite not living anywhere close. Really made me think about people that I've had friendships with in the past that I may be able to reach out to and make a difference in their lives just by being the one person (or one of a few) that they talk to on a semi-frequent basis.
It just does not work like that. Many people with stable jobs are lonely. Long hours means that you don't have connection with family even if you have it. You live separate life from partner and your children are not close to you.
One partner working long hours is enough for both partners to be lonely in marriage. Partner having time consuming hobby is enough for you to be lonely in marriage.
People in work are not friends, they are competitors, allies, enemies, whatever. They are not people you can talk with openly. Moreover, there are plenty of jobs where you work mostly alone or have only temporary relationships.