What argument is franklin d. roosevelt making in this excerpt from his "four freedoms" speech?

The argument that Franklin D. Roosevelt making in this excerpt from his "Four Freedoms" speech is: Americans should not assume that they are safe from attack and so must be prepared for war. This speech was supposed to make people understand that they have to be ready to fight for their homeland. Franklin D. Roosevelt was sure that if people get to know the four freedoms, they will think that it really worth fighting for, which will prepare America to be a success in any upcoming wars.