But the money over $250K doesn't exist anymore if the bank is gone. It doesn't matter what they would use it for. This was a risk calculation, people put more that $250K into the bank assuming nothing would ever happen, it did, and now people want all their money back regardless of the risk they should have been aware of. But the contract/rules depositors signed up for the money is gone. Now those companies want money that doesn't exist anymore. They were playing roulette with very very low odds, but odds none-the-less.
The tax revenue aspect is nonsensical when compared to student loans as you could quite easily say getting rid of student loans would allow people to have more money to purchase more things for the government to get tax revenue on.