1) There is often withholding beliefs for fear of social repercussions. Lies by omission are less guilt inducing.

This is exactly the phenomenon that I was trying to say is a big problem for a lot of people. I do not think that the rest of the world directly lies that much, but I do think they lie by omission a lot because of social pressure.

When I talk about dishonest signalling with beliefs, I am including both lies by omission like in 1, and subconscious lies like 3. 2, however, is an entirely different issue.