I'm an inventor and I've started three companies. The last company (my current one) I started in 1990 and it only cost $40 to incorporate. I once tried to start a company in Switzerland with a European colleague. We couldn't get started because the Swiss Government required that we have 50,000 Swiss Francs of capital in the bank to begin with. And, the Swiss aren't even very Socialist.
I'm a Capitalist because, despite all its flaws, Capitalism is still the economic framework that automatically yields the most efficient use of resources. The fewer decision makers in an economy, the less efficient it and its markets are. I've developed inventions within large companies, and let me tell you, even if one is lucky enough to have a boss who champions the invention, it is an incredibly slow and uncertain process. Innovation is easily crushed within bureaucracies. So, it is no surprise that many important inventions are first developed by entrepreneurs within small, agile organizations.
Sure there are poor people within any society and government should play a substantial role in helping the poor, but this should not be at the risk of losing the benefits to society of individuals who are extraordinarily talented and willing to take risks to start companies, invent new technologies (and, indeed, new industries) and employ an ever growing number of new tax payers.
Obviously, there is an important place for government and monopolies within an economy. Beyond the obvious functions of infrastructure, health and welfare, defense, research funding, etc., government regulation is clearly critical for establishing and enforcing the rules of the economic game. The most difficult problem is maintaining balance. In any complex system, the balance between regulation and freedom is a quasi-stable point that can easily swing too much in either direction. Too much regulation leads to stagnancy. Too little regulation (and/or too little enforcement) leads to the current economic situation.