Persuasive Essays should always include supporting reasons and evidence as they will build the foundation for a persuasive essay. Your ideas must be backed up with evidence to make the audience believe you.
The others are used to enhance the presentation of your essay and grab the attention of the audience
It's often futile to try to convince people that they should adopt a particular political position, but if you try, make sure to appeal to logic. Try to eliminate as much emotion from your argument as possible.