The Libertarians are wrong to take the constitution literally. It should be interpreted from basic principles that are applicable to our times.
Technically, perhaps every new circumstance, every year, we should amend it. But that is impossible, plus open to dangers. We don't want a new amendment every time are society gets a little more dangerous, more complex, more dependent on each other for our survival.
The Libertarians - unlike the rest of us - take the constitution literally because they have didactic minds - they can only think in black and white. So, you either have Libertopia - or - STALINISM! It is a psychological disease.
It is by ignoring the literal interpretation of the constitution that we became an advanced, industrial economy. Like everyone else.