The right to life and its derivates, the rights to liberty, property, the pursuit of happiness, are all fulfilled in capitalism. People are free from the use of unearned force by the government, free to acquire and keep property, and to live in an ethical way. It is also the only system which allows progress thru the value of work. Productiveness is the virtue of creating material values. In a free market, such a virtue is a necessity, to trade.
Competition is dependant on being the best, and therefore indirectly on the progress of competitors.
Without productiveness, no progress is possible because progress is part of the development of the product. Progress is a product in itself. Socialism is a system which is defined by governmental ownership of property. The government can only own property if it takes it away from its rightful owner. This is because the redistribution of wealth must be made on a certain basis.