Answer:
The Thesis Statement
This is not an exhaustive list of bad thesis statements, but here're five kinds of problems I've seen most often. Notice that the last two, 4 and 5, are not necessarily incorrect or illegitimate thesis statements, but, rather, inappropriate for the purposes of this course. They may be useful forms for papers on different topics in other courses.
A thesis takes a position on an issue. It is different from a topic sentence in that a thesis statement is not neutral. It announces, in addition to the topic, the argument you want to make or the point you want to prove. This is your own opinion that you intend to back up. This is your reason and motivation for writing.
Thesis 1: Stanley Fish's argument that free speech exists more as a political prize than as a legal reality ignores the fact that even as a political prize it still serves the social end of creating a general cultural atmosphere of tolerance that may ultimately promote free speech in our nation just as effectively as any binding law.
Thesis 2: Even though there may be considerable advantages to restricting hate speech, the possibility of chilling open dialogue on crucial racial issues is too great and too high a price to pay.