This has got to be a major contributing factor. Add in those with undiagnosed psych problems, and I'm sure it would stand out even more. [Of course, maybe they would be balanced out by the 'fakers'-- but that is almost equally alarming, and itself suggests all kinds of deeper problems.]
Both reducing the stigma of and increasing access to mental health care are hugely important right now. Most people with such issues are perfectly capable of being productive employees-- but not if they are marginalized through terrible hiring processes, workplace 'social politics' and inflexible, unsympathetic (or simply incompetent) management. A robust jobs program could certainly help.