I hear similar things from the NRA about how we'd all be safer if everyone carried a concealed firearm. I just don't want the world to be a place where we all have to be armed and launder our money after every transaction.
There is always a balance that needs to be struck between privacy and accountability. Bob Woodward violated the privacy of the Nixon white house, but we generally believe the public interest there outweighs the privacy concerns at stake. I am always particularly skeptical of financial privacy maneuvers, since they are of considerably greater interest to the already rich and powerful.