> the UAW got one of the big 3 to stop their planned closure of one of their plants.

Then they have excess capacity, which is generally not great for the union: Now if the union goes on strike the company just increases utilization at facilities in another country and actually saves money.

It also raises the company's costs in general, and so raises prices, and so lowers sales, and soon you're looking at more plant closures.

Auto companies will already move production to cheaper places. Not unionizing will not stop that.

This is really about companies sharing more of their profits with their workers which is a good thing.