Maybe they didn't fall for anything? Who did Foxconn buy the land from? They presumably did OK in the deal, as did any of the parties (i.e legal/accounting/lobbying firms) who facilitated the deal. Walker lost his governership in the last election, but that was before the magnitude of Foxconn's reversal was clear, so it's not directly attributable to that.
Looks like the people duped here might just be the taxpayers who payed for it all, and the would-be manufacturing workers for whom the jobs haven't materialized. I'd guess those groups' interests weren't being represented by their elected officials when the deal was struck.