The minarchism game being being played by the Libertarians really doesn't set them apart at all from any other political party. Essentially there are only 2 political parties in this country: The Demoplicans and the Republicrats. And they play to and are played by the same puppeteers.
A rhetorical question to ask is why do we have politics? The short response is that we do because people stupidly support it. People, by actively participating in politics just give it more energy, thus pushing themselves into the corner of outright & increasingly manipulative control.
As you point out, why do we need politics at al? After all, politics is just sanctioned lying on a massive scale.