Access to socialized healthcare is a similar factor. If a potential entrepreneur in the US relies on health insurance from their current employer, they may be reluctant to start their own business without a "social safety net".
Other things are much more important. In a sense all Americans are businessmen. There are few countries that value business, entrepreneurship, business people and property as highly as Americans.
How many old people are stuck in a job because of health insurance. There's a lot of old people.
As for America valuing businessmen/entrepreneurs/property more than other countries, how do you get to this conclusion? Have you worked with people from abroad before? From Western Europe to India, China or Africa I have seen businessmen/entrepreneurs/property being held in very high esteem. I'm not sure how I would index how society values them but I would be hesitant to say the US values theirs more than other countries.
Having lived in both Canada and the U.S. for many years, I'm curious why I've met so many more entrepreneurial and succcessful people in the big cities in America versus my extensive time in Canada. I figured having basic healthcare for all would make it significantly easier to jump ship from a job and start ones own business.