I'd argue that their reason to move was purely on SB281 (the straw that broke the camels back as it were), and if you ARE going to move anyway, why not move to the most hospitable place for this business.
I think this is probably the most accurate picture of what happened. They've been in Accokeek since the 1970s and seen plenty of political machinations over the decades. If you recall, they moved their warehousing operations to the Fredericksburg, VA area after earlier spasm of gun-control legislation. When SB281 occurred, it only made sense to find the "most hospitable place" for their manufacturing.
Who could blame them for working to get the most advantageous deal?
JoeR