I absolutely agree with you, but I also regularly get to hear about the pressure people are under to keep up appearances, and I'm not surprised a lot of younger people feel they can't resist it.
It's made worse by the toothless UK working time restrictions (look forward to those being gutted even more with an EU exit) that are abuse relentlessly in law and finance and result in staff that basically don't have time to recognise how messed up their lives are and/or time to find a way out. The amount of misery my ex has dealt with both personally (she is now in HR because while it's still tough, it's a walk in the park compared to her previous job as finance lawyer at one of the magic circle firms), and in her current job (including people regularly having breakdowns in the office at rates I've personally never seen anywhere I've worked) makes me totally unsurprised at younger employees at these places having problems finding ways to cope.