Since a "rational" man will always do what is in his own best interest, and we have a pre-existing right to life.....
...the Supreme Court ruled, in DeShaeny v Winnebago County that the police are NOT responsible for protecting citizens.
"The Due Process Clause does not impose a special duty on the State to provide services to the public for protection against private actors if the State did not create those harms. "The Clause is phrased as a limitation on the State's power to act, not as a guarantee of certain minimal levels of safety and security; while it forbids the State itself to deprive individuals of life, liberty, and property without due process of law, its language cannot fairly be read to impose an affirmative obligation on the State to ensure that those interests do not come to harm through other means." 489 US 189
DeShaney v. Winnebago County Department of Social Services
Therefore, we cannot rely on the police to help us if we are attacked, ever. We are left to our own devices The Supreme Court has stated "It is enough to note, as we have observed, that the American people have considered the handgun to be the quintessential self-defense weapon."
Since I am more likely to be assaulted away from my home, it is in my own best interest to carry a handgun for self defense...
Therefore, as a rational man, I SHOULD carry a sidearm...