A lot of people (esp people that performed extremely well in school and in corporate environment) find "failing" and "losing reputation" very stressful.
I am sure enough that I would crumble under that specific kind of pressure that I don't put myself in situations where I would experience that specific kind of pressure. Works great!
If you care what other people think that much, you probably don’t have sufficient quantities of the oft-cited “grit” that founders supposedly require.