My main point regarding Libertarianism is that, it is insufficient to effectively provide for a better society, and given the nature of human beings to be subject to vices and sheer stupidity, that if it isn't tempered with other values, you aren't going to have much of a society. The issues is for society to do more on its own, without government involvement, or you can't have Libertarianism in any form.
You can also talk about curves maximizing wealth or "prosperity", but when other things in society get neglected, because of the drive for materialism, and corporations maximizing profits every second, at the expense of everything else, a society can suffer as a whole.
Also, you can just manipulate tax rates and spending, and expect it to manage alone. In a nation with uneducated people, and individuals with severe health issues and short life expectencies, don't expect that changing tax rates will fix anything. In a society like Inner City America, deck out with bling shops, and teen pregnancy and STDs running rampant, along with crime, don't expect that you can just cut tax rates and having things go well. No amount of money is going to fit these things. And people handling freedom badly isn't addressed by giving more freedom to them. A society can drive itself off a cliff, and saying freedom is the answer, or less government, won't fix it.
Take again the case of inner city areas, with high crime. In these cases, would less government spending or more for law enforcement, be an answer? Would the crime suddenly stop because there is now an optimal tax rate? Or is it that you need there to be a level of security before things remain sustainable and you can have business?
And then, let's say there case, as has been demonstrated, where wealth accumulation happens exponentially worse as time goes on, as a nation drives itself into a third-world status. When the difference between the rich and poor grows so large, that you don't have much of a middle class, how is that society going to be able to even promise people a chance they will be able to make it?
