I think part of the problem is that there is so many credible sources to draw from when faced with this sort of thoughts. The Lean crowd will tell you to pivot,

I think part of the problem is that there is so many credible sources to draw from when faced with this sort of thoughts. The Lean crowd will tell you to pivot, but others will tell you to never give up, that big ideas are often brought to life by stubborn entrepreneurs. Many early entrepreneurs are often inspired by such stories and so that's probably quite natural for them to react that way.