Do individuals have a right to be protected from violence by others?
Do you know that in 2005 the Supreme Court ruled that police do not have a duty to protect citizens? There also have been other cases with the same result, which is as a US citizen you are on your own for protection.
http://www.nytimes.com/2005/06/28/politics/28scotus.html?_r=0
Given these two points, ask them how do you plan to protect yourself from someone who is big, faster, stronger and may be armed with any sort of weapon from a base ball bat to a knife to an axe to a gun?