Is the Criterion of Emarrassment Relevant to the Exodus?

National pride pushes people to glorify their ancestors and the founding of their nation. They especially would not have made up the idea of being runaway slaves as their national origin story. Slavery was not a desirable condition in the ancient world, and the jewish people were as sensitive to that as anybody. But you wouldn't invent the idea your nation was founded by convicts if it wasn't true long before 19 84.