What they really promote is market forces, which is not really capitalism.
Markets need a medium of exchange, but if that medium is privately held, we are all tenant farmers to the banks.
As a medium, we own money like we own the section of road we are on, or the air and water flowing through our bodies. It's not our picture on it, we don't hold the copyrights and most importantly, are not responsible for its value, like a personal check.
Basically it is a quintessential public utility.
When it is treated as a commodity to mine from the economy, rather than the social contract enabling it, ever more has to be added and ever more metastatic methods of storing the excess have to be devised.
Consider the Federal debt started to grow with the New Deal, so not only was Roosevelt putting unemployed labor back to work, but unemployed capital as well.
We have evolved far enough to understand that government, the executive and regulatory function of the social organism, should be public, but not far enough to understand that money and banking, the blood and circulation system, should be public as well.
Until then, we just get twits spouting off their hormones. The dicks on the right are as dumb as the pussies on the left.