SVB didn’t collapse because of the bank run. There was a bank run because they collapsed. It is true that the bank run may have accelerated the collapse slightly but they were in really bad shape before it started.

A lot of people want to blame depositor panic, but I don’t think that is really fair. In a properly managed bank, the assets exceed the liabilities, which means that if people want their money out, the bank can liquidate their assets to pay them and still have money left over. SVB’s assets are worth far less than their liabilities (to the tune of nearly $100B dollars by some estimates). Panicking depositors didn’t cause that.