Hmmmmm..... Let's see....
Another possible reason the article doesn't mention is that most of the baby boomers had the most defective psychology ever observed in sentient beings in the history of this solar system.
About the whites, yeah it contributes a bit, to be considered the SATANIC FORCE OF EVIL IN THE WORLD and denied freedom of expression under penalty of death dictated by anti-nazi law 939523049113.... but biology also plays it's usual role, whites are linked to introversion and relatively low self esteem, with asians an extreme version of this and blacks the extreme version in the other side of the axis.
But enlightened modern society has a solution for this "problem". We'll send in the brigade of psychiatrists. This will also have the positive side effect of making profits for the pharmaceutical comp.... err sorry, I wasn't supposed to say that..!