when my best friend was using bad ways of coping, i was really worried about her, but I really needed to be honest with her. So, I talked to her about why this kind of thing is not good for her and that she might need to find some help. Now, she is in a much better place.
When you're trying to persuade (To convince) someone yes you want to compare and contrast but when you need SUPPORT for AN ARGUMENT you need EVIDENCE.