Is it so bad? The "top 2 quintiles" is the top 40%. They want to make a statement about the extremes. I think the numbers are interesting. It looks like the

Is it so bad? The "top 2 quintiles" is the top 40%. They want to make a statement about the extremes. I think the numbers are interesting. It looks like the rich kids' distribution is bimodal with a spike at the top quintile but centered on the 2nd/3rd lowest, and the poor kids' is unimodal centered at the middle quintile.