The message I get from the article (and the economists discussed) is not "It's the Rich's Fault" but rather, "It's the Political Economic structure's Fault".
I appreciate the value of a good face-punching, but there is a time and place for everything. This article is about an economic phenomenon: the impact of inequality. You don't have to ignore personal responsibility to look beyond it. It's worth considering the negative consequence of a system that over the last few decades has allowed inequality to rise (and this isn't some magic force of nature - government policies have a huge role in wealth accumulation and distribution over time; and the wealthy have excess of power when it comes to influencing policy).
Sure, people need to spend less, but they haven't read this blog, and they think they are making themselves happy. There are at least two solutions to this that are not mutually exclusive: 1) promote better spending/consumption habits (e.g. MMM), and 2) implement policies that put a brake on rising inequality, support educational, financial opportunities for people in lower and middle income/wealth groups, etc.