I find quite a lot of people do not agree that it's important to talk about it, for whatever reason. My guess is that overcoming the social stigma around showing your emotions/sharing problems is mostly to blame. Perhaps most people in my social group actually have had such problems and don't even feel comfortable in the meta-conversation.

I often say things like "people should talk about this kind of stuff more because it would help them through it". I obviously mean it in a general sense (very much not trying to get specific people to talk about specific problems). Responses vary from an insincere "yeah..." to the rather odd "you can't tell people what to do".