I have a right to privacy, and a right for my actions to be free from government scrutiny until, at the very minimum, they can show probable cause with a search warrant.
Deputizing the banks to spy on me just makes those banks obligated to the same rules.
Money laundering is a crime predicated on the idea that the money I rightfully own is something they should be able to confiscate from me on hypothetical crimes, and they're attempts to seize it often cause people to try to make it less suspicious to the government. It's bizarre.
If they wanted to fight organized crime, the simple way was always to legalize cocaine, meth, and heroin, and sell that shit out of liquor stores in plain retail packages, all manufactured by regulated pharmaceutical companies that would produce it for a fixed, low profit-over-cost, in measured doses and free from unsafe adulterants.
Government causes problems with bad laws, blames the problems on the criminals, then makes more bad laws to punish them for it, causing more problems. As it is now, it's illegal for you to own and possess cash, though they tend to ignore it as long as you don't keep any in tempting amounts (typically less than $1000).