Insurers aren't the main villain of the U.S. health care system

In a post last week, I wrote about the progressive anti-monopoly movement’s increasing disconnect from reality. I wrote:[C]onsider the movement’s choice of targets. These include some industries with high profit margins, but also some with very low margins. These include grocery stores, airlines, and health insurers. Grocery stores and health insurers both consistently have much lower profit margins than American corporations in general, often hovering near the zero mark.Commenter Matthew argued that the low profit margins of insurers are not a reason not to worry about their market power:The idea that health insurers have “low margins” so they are OK is nuts…Private health insurers in the US do not lower costs and do not improve patient care…In the flow of money between patients and providers, private insurers just sit in that flow like a tapeworm and take money out to sustain themselves…There is a lot of evidence…[W]ith the current status quo, 10 -15$ out of every 100$ of healthcare…