My personal understanding is this:

Libertarianism
Equals
Adam Smith's "Enlightened Self Interest"
Minus
"Enlightenment"
Plus
"The Second Amendment"
Minus
"Militia"
Plus
"My Tax Deductions"
Minus
"All the Other Tax Deductions"
Plus
"My Social Security and Medicare"
Minus
"Welfare".

I really don't care what anybody else thinks about Libertarianism, because it works just fine for ME.

Which is a huge

PLUS

"I have studied. I have thought about it. I know I am correct." J. Coleman (Founder of the Weather Channel poo-poos Globwarm)