I think it is a combination of all those. It's just an overlooked cause. I think many avoid it entirely because they believe it demeans women. As I said in anot

I think it is a combination of all those. It's just an overlooked cause. I think many avoid it entirely because they believe it demeans women. As I said in another post, more capable about came to the fore in much large droves than the US could ever take at one time from immigrants. We now had a massive surplus of labor. This would drive wages down. With this, the collapse the union base, and add new cheaper labor in the rest of the world. Also enact free trade policies that didn't tax imports that used essentially slave labor to make their products. The end result is depressed wages from without and within. So too automation rendering a portion of this pool redundant.