The term "Capitalism" gets thrown around and has become a pejorative on the political left. So maybe we should define what we mean by "Capitalism".
A free market is one in which you get to make free choices. The opposite of this is tyranny, but no society is either completely free or completely tyrannical. Being free to make choices includes the freedom to make voluntary exchanges, to own property, and to do business for your own benefit.
The definition of Socialism is that the means of production is socially or collectively owned. By definition, the means of production can't be privately owned, which requires an authoritarian state to take away people's right to engage in commerce. This makes Socialism not only evil, but impractical because it prevents people from acting in their own benefit, and it prevents the innovation that would come from large numbers of people doing business. It also takes away incentive structures of success and failure that result in a more efficient free market.
One thing that the political right believes that maybe the political left doesn't is that people respond to incentives. Give people an incentive to not work and they won't work. Give people an incentive to be productive and innovative and they will be productive and innovative.
These claims are easily demonstrated by looking at how various economic systems have faired. Far-left economic systems have faired very poorly and have been a disaster for the people living under them. All you need for a prosperous society is to embrace a free market to at least some degree.
