How does an Austrian Economist support Social Security?
I am seriously asking.
One couldn't. There are several factors in the pure Austrian Economic school that fly in the face of the entire principle of Social Security. First, of course, is the individualist principle of the Austrian school. Basically, there would be little or no regulatory involvement with your personal economic issue. This is the good part of the Austrian school, albeit, they take it a little far by their statements that single form currency itself is an artificial construct.
Second, the Austrian school rejects any sort of metrics and statistical based analysis because of the belief that human nature is too dynamic, and thusly, cannot be calculated. They reject past history as a valid use of future calculations. This challenges the social security concept because one cannot predict the needs or economic growth rate of the individual in xx number of years. (praxeology)
In a nutshell, under the Austrian Economic school of thought, social security would not exist because it is not any institution's responsibility and secondly, because one cannot predict the needs of the individual when he is ready to cash out (if he survives that long.)
It is a lot more complex, but that is the simplest way to address it here.