Lew, I agree completely with you (and Rozeff). As detailed in posts by S.M. Oliva and Glenn Greenwald, it seems clear Amazon is just a victim of the state, and as a libertarian I make it a policy never to blame the victim. And who can blame them for capitulating any more than taxpayers are to be blamed for coughing up the dough? Amazon is skating on thin ice as it is in heroically helping people avoid sales tax. Of course it's rational to fear the state. Thus I disagree with condemnations of Amazon by libertarians and calls for a boycott.
Further, Amazon's managers have an obligation to the shareholders; they have no right to risk or waste shareholder money for political grandstanding. It's not their money they would be risking. I also think that in addition to the anti-war libertarian activists who are up in arms about Amazon's pursuit of profits instead of activism, a number of left-libertarians are using this as an excuse to pile on Amazon because it's big, a corporation, and profitable.
And I, like you, have always disliked boycotts. That said, libertarians can disagree on this tactical issue; this is just my approach.