Taboo: Intrusive thoughts

I never hear anyone talk about this, is it sort of taboo? It is a symptom of OCD, depression, anxiety and PPD. intrusive thoughts do not mean you have psychosis, they are simply that: Intrusive, unwanted and unwelcome.

Is this a common struggle to women and even men? Why is it taboo to talk about it? More than half the people that suffer from intrusive thoughts never speak out. Why not?

Is this really something to be embarrassed about? Should it be talked about, and researched more? Much like its components, depression etc?