In capitalism a person can own his own business his own house his own property. In socialism only 1 owner the government as in single payer(that's why democrats push so hard for government healthcare etc.).
In America 86% of millionaires started out poor ,proof:
http://www.thomasjstanley.com/2014/05/america-where-millionaires-are-self-made/
This what liberals/democrats hate the most that a person can make it on his own , make his own way and not need government. They hate that when you have money and wealth you can have freedom because then you can do what you want to when you want to and own and buy anything you want to that is produced in the market.
If you have a million dolllars or 10 you don't need government , you don't need politicians and you are truly free. So capitalism is the only way that you can make your own way and have freedom. And liberals /democrats hate hate freedom . democrats want you all enslaved to govefrnnent and them.