The Comic doesn't mention Republicans. It presents a set of ideals held by unreasonable people in the U.S. Republicans are obviously a large diverse population of people who can be respected. What this comic does is reminds People who are acting rediculous, that there is an equally rediculous solution for them, and hopefully lets them think twice about their sentiments. That's what makes it a constructive commentary.

As for pure communism, that has never been achieved. Russia and many other countries have always been a dictatorship, under the guise of communism (not that communism would work either). And nearly all of Western Europe is a type of Socialist Democracy, so saying Socialism doesn't work, is like saying democracy doesn't work. Sorry, the western world has applied principles of both, and both have been positive in a number of different ways. I lived in Germany for a year, it's like freakin' Disney Land compared to here. But that's what I love about the U.S., it's challenging.
By the way, Capitalism works too. It's just that in the world of politics and economics, nothing works perfectly, that's why there has to be checks and balances. We're working towards a more perfect union, not trying to preserve one. 'cuzz it ain't perfect.

http://www.youtube.com/watch?v=qtGkTRnocZI

It's silly to suggest that Republicans are anarchists. Isn't it obvious most of them aren't after the last 8 years? It's just as farfetched to suggest that all Democrats are communist.