Has it always been there but hidden or is there something about modern society that causes these issues?
Always been there, but hidden by the social norm in the West of 'stiff upper lip" admiration being imbibed from early nurture. It makes both the ability to discuss personal problems and react to them with empathy and understanding difficult, if not impossible. More recent attitudes have 'given permission' for some of those affected to speak out, but it requires little searching to find the embedded "Man up!" as a stock response.
Those of US who live with the visits of the 'black dog' are (if they are lucky) aware of its insidious effects and unheralded arrival. Again, if lucky, the recognition of presence triggers a practised response which can be excessively anti-social but non-lethal. Recognition , and being fortunate enough to have personal support and previous effective, understanding counselling, is the key, but the needed information is not readily available.