Why is it important that parents talk to their children about social issues such as divorce, finances, and unemployment?

so that the children have conditions to interact in modern society.

In order to succeed later in life, you need to be taught the basic principles of such topics from a very young age. This way, it's important that you're parents tell you how such develop or work, so that you won't feel afraid and not at a disadvantage when later exposed to such a issue. It also helps children, by simplifying the world around them.