When constructing your thesis and offering supporting evidence, be sure to always be factually accurate. While necessary in all essays, this is particularly important in persuasive writing, in which the author sets out to present to the reader a cogent world view. Like a single loose strut in a foundation, many strong arguments can be undermined by even one untruth or inaccuracy.
One of the keys to compelling persuasive writing is specificity and detail. Few readers will be swayed by broad generalizations; rather, for maximum effect, all evidence should be as specific as your line of argument allows. Not only are specific factual arguments harder to refute, but like all specific writing, they tend to make more of an impression on the reader as they are more vivid.
When supporting your argument, use different types of evidence to make your point. These can include examples of the scenario you've described, quotes from experts and relevant statistics. As with different types of weapons, one kind of evidence may have little impact on the reader, while another may have a devastating effect. In most cases, deploy your whole arsenal.
Reading a persuasive essay is likely to draw up in the reader a number of skeptical questions, or perhaps bring to mind a number of common rebuttals to the argument being put forth. A good essayist will be able to anticipate these lines of attack and offer appropriate responses within the essay itself.
A good persuasive essay appears airtight. Although the argument itself may be modest, the author's view of the world appears comprehensive, with little room for doubt or ambiguity. Along these lines, an essayist should strive for consistency not just in logic, but in style as well. The author should strive to maintain the same voice and tone throughout the course of the essay. A style that appears inconstant can foster doubts in the reader about the writer's sincerity.
Finally, try to be entertaining. Although writing can indeed be both boring and factually correct, the reader is naturally hesitant to agree with something that is dull. As a writer, you stand a much better chance of convincing the reader if you can make them like you first. Therefore, try your best to make them enjoy what you've written.