Actually, the politicians knew exactly what Amazon was going to do because they told them well in advance:
http://www.actualitte.com/librairies...vres-51268.htm
...and they went ahead anyway.
As for further anti-amazon action...well all the rhetoric leading to the passage of the bill made it clear the law was passed to target one specific foreign company which has already brought up the matter of a WTO complaint and possible retaliatory measures from DC. So it is entirely possible the politicians gave their publishing "constituency" a bill with limited impact on purpose to get them to shut up and go away without starting a trade war.
This may be the rare case where it is simpler to attribute to malice what sheet stupidity can't justify.
