By definition, capitalism is an economic system characterized by private/corporate ownership of capital goods, by investments that are determined by private decision, prices, production, and the distribution of goods that are determined mainly by competition in a free market. It is an economic system, nothing more nothing less. While there may be some "nasty" individuals that enter into the equation, there are equally many more decent human beings to counter the crooked ones, and whom of which offer services or goods that vastly improve the lives of many others.

There are nasty and crooked individuals in all segments of society, and to be fair there are certainly opportunistic types gaming the social welfare system. On a side note, it's worth mentioning that there has been some controversy over Keynes having shown sympathy towards nazism, and Keynes was described by some others as having antisemitic inclinations.

And hence, Keynesian monetary policy...