Greetings!
Here are a couple of things to remember when writing your thesis statement:
In formal writing, don't use contractions (like I just did ;-)) say "do not").
Remember that your thesis statement is essentially taking a position which the rest of your paper will then support. You might therefore want something a little more persuasive than "Americans are scared of hackers." Is your point that, if they understood hackers better, people would not feel afraid of them? Is the problem with the term "hacker"--perhaps because it is a broad term that includes people who would never commit a crime? Shouldn't people fear the type of hacker who would steal their identity or money out of bank accounts? If your point is that a "hacker" is not always a thief or virus creator, be sure your thesis includes the idea that the term is more all-inclusive than that.
The first sentence of your thesis statement is too vague to really contribute much. Compare that to the one I wrote, which is more specific. (You're free to use any part of mine you find helpful.) Also, when you start out with "what they know, what they do, and..." you must finish with "what they _______"; don't switch to a different type of phrase like "by the media."
I hope this helps!
Thanks,
Sarah, EssayForum.com
Sarah, EssayForum.com