I think it is because human rights abuses by the US government are becoming more common. Or at least more brazen.
But people, mostly young people, are clearly more vocal about pushing back when abuses come to light.
I mean: https://www.abc.net.au/news/2018-11-01/satellite-images-expo...
It's hard to imagine the average person having access to this kind of reporting 40 years ago. (the 1990 was 30 years ago next year...)