These are eyelashes!

I agree with the main premise of this post and would call it an essential feature of being an entrepreneur. However I really must take issue with your statement that *employees* should be raising rejectable ideas 50-80% of the time. Employees like this get fired. You and your fellow entrepreneurial-minded types might wish your employees were more like this, but in most established companies, in most positions, people like this get fired. You're not supposed to have a better idea than the boss about how to run stuff. Most bosses want followers, not leaders. So the reason people don't do it more often is not because they're timid but because they're smart. They want to keep their jobs and not have the rest of the crowd think they're crazy. They know that the best way to get ahead is to have one good idea about every year of so and keep their mouth shut most of the time. Then they're stuck in that mindset. This culture builds on itself until you have a nation of lemmings. But your advice still stands for anyone in the startup environment, anyone who wants to "be their own person", and anyone with job security, such as CEOs.