As usual, you're wrong...
First off, you'll find that socialists (once they get into power) are some of the strictest authoritarians around... Examples include the (former) USSR, China, Cuba, and North Korea... And who has been behind the "speech codes" on college campuses around the country over the years. Or (for the most part) behind "hate crime" laws? Libertarians are about as far from authoritarians as you can get...
Secondly, the differences between Republicans and Democrats ARE shrinking. Just as Clinton pissed off many of the "hard core" democrats by taking up the banner of some of the republican (and more conservative) issues, like welfare reform, and "beat the Republicans at their own game," today's Republicans are quickly abandoning many of their conservative values. It's not exactly something new... It goes back to the beginning of the Bush administration, with the education bill he pretty much let Ted Kennedy write. But did he get any credit from the leftists on that? No. In fact, I think that Kennedy would rather take swimming lessons than ever give President Bush credit for anything he does. No matter how much republicans try to "make nice" with the DemonRATs, they will always stab you in the back. Look at the entire "Memo-Gate" mess to confirm that. The RATs are even willing to politicize an intelligence committee, just to try to take down the President.
About the only difference between the Republicans and Democrats right now is that the Republicans are trying to save the Republic (at least, most of them are), while the Democrats don't care who dies, or what they destroy, as long as they get back in power.
So, you may not agree with Libertarians, or their beliefs. You may not even like them as people. Fine. Just try not to lie about them... Otherwise, You're no different than the DemonRATs who "slime" people they don't agree with.
Mark