My bank account was stolen. Why did the police say that the bank was perfunctory if it didn't cooperate?

The money in your bank card was stolen. The details are criminal cases, and the amount is huge (15W or more). Why not report it? This is not a civil dispute at all. I really don't know what you think, but it will cost tens of thousands of yuan in legal fees. When you report a case to the public security bureau, you can solve the problem without 1 money. With such a large amount, it is certainly possible to solve the case.