Veidt seems more like a socialist than a capitalist. Plus most nazis believed they were helping "create a better world". Communist/socialist dictators (like; Pol Pot, Stalin, Mao, etc.) murdered millions of people. They to believed they were creating a better world. The nazis, communists, & the fictional Veidt all believed that "the ends justifys the means".
Fascism is a disease --or more accurately a symptom-- of capitalism (as are, arguably, some of the extreme horrors perpetrated in the name of socialism --Stalinism, etc).
Veidt, the multi-millionaire investor and manufacturer, who marketed his image to the consumers of the world and functioned as an arms dealer/manufacturer (Daddy Warbucks), was most definitely not a socialist in Watchmen. Capitalist, investor, businessman, corporate raider, whatever. But not a socialist.
Given Moore's politics (or what I understand of them: "crypto-anarchist hippie magician" is how I would describe them), the character of Veidt reads as an implied critique of capitalism and and its exemplars (Warner/DC, etc). Just as the Comedian can be read as a critique of US foreign policy from Korea on. Or maybe he's just a fun homage to Charlton Comics.