Also it's not like once you have 250k in the bank, you're suddenly a finance wizz, omniscient of all the tricks and tips with regard to treasury management. Even as you get into the low millions of net worth, it's not like you suddenly became a HBS graduate. A lot of regular hard working people end up hitting those limits and wouldn't reasonably be expected to learn about treasury-foo. A lot of young or small businesses are in the same lot. Being somewhat wealthy doesn't turn you into a fine financier. And even if you think those folks should hire advisors, it's not like they can afford to hire the right ones with this relatively small amount of wealth.
I think resentment of having gone through the pain of spreading your cash, in vein, isn't a good reason to screw up hundreds of thousands of salaried employees, and a bunch of regional banks.