Steven Sinofsky says the culture of a big company is as fixed as a law of physics, and that's why they don't crush startups: "It's weird that they teach disruption as a theory in the business school, when really it should just be a fact in the physics department." "You always think, 'Oh my God, we're just gonna crush all of these little companies.' You always think that when you're at the big company, and then you realize they never get crushed." "The startups don't aim straight at the…