Not American and I'm annoyed by the US pretty frequently but I'm not really sure why the US having teeth when it comes to clamping down on global money laundering is a bad thing.
The financial sector appears to be the one sector where US authorities actually do a good job to stamp out crime, and I can obviously understand why the US will not tolerate an completely unmonitored shadow economy that could easily be used for sanction avoidance by Iran or any other rogue state.