As I have always said, I would no more try to persuade a Libertarian from basing policy on concepts of morality as I would anyone else. I just dislike it when moral systems masquerade as economics. I can argue why I believe it creates a better world, and that it is ultimately to the benefit of all individuals, that the government have the power to tax and use that power to provide for fundamental needs for everyone. But I cannot prove a point of morality, as such things are intrinsically irrational. The person who believes it is morally wrong to tax the wealthy at a higher rate, and to use their money to provide services they do not want to people they do not know, is entitled to his or her belief the same way I am entitled to my belief that God regards eating shrimp as an abomination for myself and my fellow Jews.
I just don't confuse my religious beliefs with any actual theory of economics, and I accept the consequences that come from my religious beliefs.
As a practical matter, this is where the friction may come between the business community which has embraced the Tea Party and the Tea Party true believers. But we shall see. Even the most devout may succumb to temptation.