The problem was that this stance was used to justify claims like "the free market allocates resources in the most efficient way" and "all taxes incur a deadweig

The problem was that this stance was used to justify claims like "the free market allocates resources in the most efficient way" and "all taxes incur a deadweight loss" which are big statements to make based on such basic coursework. If the class is going to make claims like these, it needs to start with realistic assumptions.