An argumentative essay is as good as the topic upon which you are basing your argument in opposition to a conflicting school of thought. Now remember basing your argumentative essay on a topic that interests you is not enough. You should have enough supporting facts that allow you to prove your point of view with reason based logical facts.
You can not simply believe one point of view and argue for it; you have to provide solid grounds that that will allow you to convince the reader.
In the case that an argumentative essay is read and the reader replies that they do not have sufficient knowledge on the matter to take a stand then you have basically failed in writing an argumentative essay.
Now in order to develop an effective argumentative essay begin by listing down points that are both for and against your subject Initially you have to provide an evaluation of both perspectives (to and fro).
Now remember the key to developing an effective argumentative essay is to find out each of the supporting points of the apposing school of thought and figure out how you will negate then in order for your argument to prevail.
Now only an uneducated individual will get emotional in proving their argument. If you want a knowledgeable individual to agree with your point of view then you must provide solid evidence that is factual and objective which supports your claim.
You basically have to provide proof without any emotions involved.
In your argumentative essay you have to investigate both sides of the story and justify the position you take.