The most important aspect when presenting any argument is to provide a clear and precise thesis supported by evidence. To support the premise the government is unable to protect the citizens, you should have at least three reasons why you believe this to be true. These reasons, such as poor national security, political strife, inability to handle the size of the borders, or problems with police forces, will make up the main body of the paper. The arguments should be simple, factual and address the reason without bias.
The introduction to the work is where the writer typically has more leeway in presenting the premise. The introduction needs to do two things. It should get the reader's attention and provide the thesis for the work. The thesis is one or two sentences laying the groundwork for the body of the paper. The attention part is where you, the writer, can have some fun. There are several methods to attract attention. You can provide the reader with statistics in an attempt to educate or shock them. I prefer to use illustration by giving a dramatic narrative to the work. You can include an example of how the government failed to protect someone based on your thesis. The gripping tale attempts to latch on to the reader's emotional side rather than logic.