Comment on why Merck did not update the warnings on Propecia in the US even though it did so in other countries

Why didn’t Merck update its U.S. labels back in, say, 2008, when it updated the Swedish warning?  Maxwell Kennerly has a good comment on it here in which he discusses this issue.  He also argues that when, eventually, the company did change the warning, it adopted language that is "designed to make doctors and consumers ignore the warning."