One of the many reasons that Boeing is moving down there is that they won't have to pay into unemployment, something that costs them millions each year. The downside to this is of course when (not if since it's Boeing we're talking about) they decide they've hired too many people down there and start to lay off again the people in the SC plant will be out of a job and not be able to collect one penny to help them survive.
If there's one word describes Boeing for the past 10 years it would be failure, every decision they've managed to make has cost them money and none of them are working out the way they'd hoped. South Carolina will end up going the same direction as everything else this company has tried to do lately, they believe that hiring an underpaid workforce that has little to no experience in manufacturing will work out for them when it's only going to end up in more delays and a defect rate that will cause more customers to flee to their competitor.
The union is not free of blame in all of this either, the utter incompetance and greed that has corrupted them over the last few decades has turned a lot of their own people against them and has soured any support them may have recieved in the past from the media.
The attitudes that are being shown by both Boeing and the IAM are pathetic, everyone wants to blame the other side and the employees are stuck in the middle of two bickering parents just hopeing that at the end of the day we have a job to go to.