There are many social problems facing us today in Taiwan. Although we have plenty of complaints about the probems, strangely enough, the problems take place again and again.Why does this society have no ability to learn to get rid of these social problems? In this paper, I take"food poisoning"as an example to explore the issue of why this society is unable to learn.It is found that there exists important drawbacks in the public discourse when a social problem does occur. Simply put, the public discourse is always an "external"discourse with no people directly involved participating in the discourse. Under this situation, the discourse always revolves around principles and ideas, not technical details. Moreover, the discourse is carried out in a circumstance with no affective sentiments. It is therefore impossible for the discourse to be transformed into social action. This is why the society repeats itself. In the end, the concept of radical democracy is employed as a remedy to tackle the problems raised.