To update the old idiom: A lovesick fool and her money are soon parted.
Amazon repeatedly said if TN made them collect sales tax they would locate elsewhere. After they spend millions erecting buildings and building infrastructure, we have them "locked in" and are going to change the deal? While you might get a short term victory of more tax money, long term you lose. TN would prove that what it said could not be trusted, and a smart company would build in a state whose reputation isn't tainted.