There are many reasons why companies leave the USA. Taxes and union workers being two of them. Trump is correct on some issues while not addressing other issues. He’s not perfect but he’s making the Democrats and Republicans crazy. What’s not to like about that?
I can see how that fact is attractive, but beyond that, there are real problems. Trump is basically a fantasy and is just not aware of the depth and breadth of the problem and not philosophically equipped to deal with it. Cruz comes closest if not fully aware (telling Bundy to stand down makes me wonder).