Potentially every system can be dangerous whether it be capitalism or communism or socialism. The big dangers of capitalism is you get what you earn. Yes its great to keep what you earn but there are no exceptions. If something happens to you and you can't work, it's your fault if you go hungry because you failed to prepare. In short in a true capitalist society everyone is on their own. There are no social programs because everyone is expected to provide for themselves. You would be left to the mercy of the rich and powerful aka. Anyone with a means to survive and we all know how that usually works out in the grand scheme of things. So yes capitalism in its purest form can be very dangerous.