Manufacturing jobs are also some of the most unstable because big companies will shop around for tax breaks. Once they find a political sucker ... they build a new plant and close the old one which wrecks havoc on the local economy. PR teams are designed to mitigate negative feedback when this happens.
Smart politicians know this and will not concede to tax breaks for big companies, like Amazon.
I mean if these jobs are so bad, isn't it good that California is trying to not have them in its own municipalities? The way you laid it out, shouldn't everyone be trying not to have those jobs?