Growing trend of people sitting on the floor on subway trains

I have been seeing this for a few years, but it seemed to be mostly students. Now, I am starting to see adults do this. I am mostly riding the subway during peak hours and see this more and more after 5pm. With all the PSAs about good and safe behaviour on trains and in stations I don't understand why this annoying and inconsiderate trend is not being dealt with. No, you do not take up the same amount of space when you're standing as when you're sitting cross legged on the floor. It's usually at the front and back of the train, but not always.

The Korea I first visited in 1997 wouldn't have needed PSAs from the transit authority to deal with these miscreants. Halmonis wouldn't have stood for it for a second.