There's nothing wrong with capitalism. It's just that the GOP is more interested in establishing an oligarchy than in preserving the Republic. Their notion of unregulated free-markets presupposes a rational society...which we clearly lack.
But the GOP is as much of interventionist as the Democrats... as Bush has plainly proven. The batch of Republicans we've seen recently wouldn't know free markets if it hit them in the head. The control of our money supply, by a central bank, is the anti-thesis to a free market. Think of how many wars were funded by the notion that the federal government can print any amount of money whenever it wants. Iraq, itself, wouldn't have been invaded if there was no money to be printed to fund it. The invasion of our privacy, through spying, wouldn't happen, again, without a central bank printing the money to fund it. Think of the hundreds of millions that have died in wars as a result of the command economy last century. Think of the millions that live in poverty because of the inflation produced by a command economy. Command economies should remain an unfortunate relic of the past, but it seems, we are eager to regress to a point in time where our King decides who can own property, what we are to do with our property, and how we are to make a living. In essence, we haven't had free markets since 1913, and only sparingly before then.
Now a gold standard has it's shortcomings. But it's certainly a lot better than what we have currently. Although, there have been times where dictators have done away with the standard, in order to pursue war (i.e. Lincoln, Wilson, FDR, etc), it does restrain government power a lot better than the last 35 years of fiat has shown.
Rationality has nothing to do with freedom. Every person will act differently, spend or save differently, and that's assumed in a free society. There isn't a mold every person should fit into. In my eyes, anyone that supports economic regulations, if were to remain consistent on their belief government can control its subjects like the days of monarchies, must believe that regulations of their private behavior is acceptable as well.
The dictator would surely say, "Speech must be regulated! Press must be regulated! Right to protest must be regulated! Privacy must be regulated! And, lastly, property must be regulated!" For some bizarre reason, property regulations are deemed okay, despite it being the most regressive and intrusive regulation of them all (I'd rather be able to eat than be able to do things privately, slightly), yet any infringement of the other freedoms we have are quick to draw the ire of the bulk of our population, as they should. But in actuality, there is no difference between economic freedom and civil freedom. You can't have a free republic without unregulated, undisturbed, free markets. It's impossible. If you want your leaders to control property, you are submitting to them the most awesome and ultimate power, and that is not how you achieve freedom. The best option is to let the individuals control their destiny, of course, through the unregulated free-market.