What is the central idea and a writing strategy that conveys the central idea in Life In A Shelter 1963 Thamar E Dufwa

The main idea of the text it's to explain and convince American people why it's necessary count with a shelter at home. In any moment can happen a tragedy and people must be prepared, it is important to know what to do in those cases because it's the family's life and own that is in risk, and it's important to take care of them. In a shelter could be a family with food, spaces to sleep, games or books to pass the time, and the most important, spend a good time with family in a secure place and not outside with a lot of dangers.