@Damien: "The freedom for everyone to live a worthwhile life."
Most of us want that. The question is how is this best achieved? Some people believe that free-market capitalism gives people the best chance to live that life. When Adam Smith wrote the Wealth of Nations one his goals (maybe even *the* goal) was to raise the standard of living for ordinary people.
How is this best achieved? I am in the free-market camp. We could talk about the theory behind why it is best economic system. Or we could just look at the world. The countries with the highest standard of living are free-market capitalist economies. Take America for example, it's not perfect, but to be born in America is to win first prize in the lottery of life - compared with most of the world. Australia, New Zealand, Canada, Great Britain etc - these are all countries that people from countries want to emigrated to, not from.
I am not totally committed to any ideology though. Material wealth is not everything. If the goal is more about how evenly the pie is split (even if it is a smaller pie), and if the real issue is not how much you have but rather how much you have in comparison to other people - then some kind of wealth redistribution is called for. IF that is the goal. But even if that is the goal, you are still better off with a free market economy: but redistribute the wealth via education, health, family payments, social services etc.
I also believe that there isn't any one best system for all cultures. I don't think the indigenous hunter gathers of the Andam Islands would be better of under free-market capitalism or communism.
Both capitalism and communism need for the people to have a sort of mind-set. They have to "get" the system and no how to play along with the rules. Perhaps this is why attempts to impose these systems on some third world countries have been unsuccessful? So I am not just a free-market capitalist. I am first a pragmatist.