On Sunday, the U.S. government stepped in to backstop depositors in Silicon Valley Bank when no one else would. But the mythology that has made Silicon Valley start-ups the darlings of the American business world may prove harder to recoup. The resentment speaks to a growing sense that Silicon Valley, once a beacon of ingenuity and innovation, has lost the one thing banks need even more than cash: trust. And in the wake of its implosion, the trust the start-up sector has received from regulators, politicians and the public may be among the casualties. Now, in the eyes of many, Silicon Valley is the entrenched business establishment.