Because It's the Natural Thing to Do

Why Ted Cruz was making a biblical case for gun rights after the Odessa shooting [More]

That used to be preached from pulpits:

"He that suffers his life to be taken from him by one who has no authority for that purpose, when he might preserve it by defense, incurs the Guilt of self murder since God has enjoined him to seek the continuance of his life, and Nature itself teaches every creature to defend itself."

[Via Mack H]