Speaking persuasively or arguing a point is something thought of as a negative form of communication. this is not so unless the speaker says or does things which are aggressive or humiliating to others during the speech.
By arguing your case, you are expressing your knowledge and beliefs and you are persuading the audience to accept your point of view on the topic. Although not everyone in the audience will agree with you, an effective persuasive speech guides the audience to accept your side of the argument as far as possible.
