If you want to get out of the rat race and start your own business, you’ve gotta be optimistic, because it’s tough out there. In fact, a good old fashioned glass half full outlook might not even be enough. An entrepreneur needs “delusional optimism,” according to one Inc. interview, or “irrational optimism” according to another in Entrepreneur. Well, as we probably should have expected from self-promotional bromides, these assertions might actually lead talented founders astray.