My takeaway from the Wikipedia excerpt is that being afflicted w/ confirmation bias equates to being in denial. Healthy denial seems oxymoronic, as denial precludes risk management...
As best I can recall, relevant (meta-analyses of) studies of entrepreneurship concluded that successful entrepreneurs are typically very mindful of risk. Amar Bhide's book The Origin and Evolution of New Businesses may be a good source for a survey of the aforesaid scholarship.