It is a pretty good economic system, however, which is why anyone who can choose elects to have a capitalist-involved economy.
Some socialist ideas are popular too, and seem prevalent.
Look at the figures. This, and not the alleged insensitivity of capitalists, is the primary issue when judging left-wing proposals. The connection is based on common policy and philosophy, and not simply an arbitrary classification. Thus, in the case of Clinton, his affiliation with the liberal faction is mitigated by his attitude towards business and the economy. He has adopted fairly conservative policies in respect to business, and has suffered accordingly amongst radicals in his party.