Argument: Do horror movies cause some people to act out the violence they watch? Why or why not? A good thesis statement will accomplish the same thing.
The thesis statement is then "proven" throughout the paper with supporting evidence. A good argumentative thesis is centered on a debatable topic.
Here are a variety of examples for different kinds of essays: Cause: Why are Americans rapidly becoming more obese? Click To Tweet Picking a side is pretty much the whole entire point of an argumentative essay. Expository: Is there only one way to write a great thesis statement?
The semicolon makes the thesis statement stand out for your reader.
Adding a "because" to this statement will help, as will avoiding the vague word "good. Example: I think that prolonged looking at violence is dangerous because watching violence: causes people to be desensitized to real violence; makes some teens desire to imitate the violence, or ignore the violence of others; and leaves the viewer wanting even more, and bloodier special effects in the next film.
It will also help keep you, the writer, from getting lost in a convoluted and directionless argument.
Sometimes this is easy, because your teacher will provide you with a question to answer, and you can formulate your thesis from the question. Mets or Yankees? In the example above, each phrase starts with the same sort of word: causes, makes, and leaves.