“Mass conditioned depression” would imply that individuals have no autonomy or ability to think independently of what big media is saying. 

Doesn’t make sense because how would you explain individuals that don’t? Eg Preston, Lyn, Lavish, etc 

 To address that “mass condition“, a number of factors: education, inclination, good mental health, etc…

Invert it: how rare are those people how many people live under a cloud?