I think you must be right. When I was growing up I was told over and over again that I could be anything I wanted if I was tenacious enough. It all fits in neatly to The American Dream. It's not hard to see how the blackpill contradicts the notion of self-improvement being the pathway to success, and that's an ideal many hold dearly (I was once one of them!).
Working hard to achieve success sounds great, but unfortunately it isn't true. And you're right, Buddhism seems to have a clear emphasis on accepting life the way it is.
It's weird: the left wants everybody to be equal (despite the unending contradictions to that belief), and the right wants to 'blame the victim', (because they want to believe life is self-determined). And they are both so, so wrong!