Praxeology is literally the study of human action, not ideas or thoughts. If anything stupid ideas are not a scarce resource, with limited use.
Over time the market can dicipline bad ideas, but i hope you can appreciate the difference between a product or commodity in a market and bad ideas which can thrive based on psycological, political and even biological factors.
Is demand not human action?
Nope. In the austrian school from which you are borrowing the term "praxeology" demand also known as "human needs" and "wants" knows no end. It is not a scarce thing. Human action *are* limited
"Meeting demand" and all the steps leading up to it, are human action.
Even in the gaussian flavor economic analysis (purchase and sale patterns as rivers of activity) the upper bound for demand is necessarily open ended. It uses transforms based on historical data, but in reality the demand for any given good is infinite.
Attempting to say demand is limited by production or potential production or even the finite amount of resources on earth, is to at once run up against the economic calculation problem aswell as to place a limit on something that is not limited. Human wants.
Overthinking it.
