Why?

I hear that Carrier had previously turned down the Indiana offer of support to keep their jobs in Indiana.  The current thinking is that the motivator to accept the offer now is that the parent company, United Technologies, is a big defense contractor and that they want to stay in Trump's good graces.
Moving on to the why of the election, the carrier issue is a microcosm of Republican politics.  It's about control.  Just like Senator McConnell promising to make Obama a one term President and Boehner promising obstruction of Obama's every initiative.  Again, Republican control.
While the democrats try to compromise.
Here's my point.  democrats are playing the wrong game.  Republicans have been seeking how to attck going back to the President Clinton impeachment.
Now Democrats are dithering over why they lost and why they are loosing voters.  They don't play rough (or dirty) - choose your own perception.  Yes, perhaps they needed to hone their economic message.  But it goes beyond that.  Democrats need to attack Republicans. 
Add to that the Republicans ready targets - there is a segment (a large one) of white America that is only too happy to revolt even now against the idea of an African-American President and white male America continued the revolt against the possibility of a woman as President.
Democrats, stop arguing and start fighting!