When a man starts drug addiction, he becomes addicted to it forever and goes on increasing its dose. In the first phase of drug addiction his brain cells become irritated and his faculties of rationality, ., judgement, observation and attention get blunted and he becomes the victim of sub-clinical stage. In the second phase, the addict feels as if he is not aware of his own self and such and psychic trauma leads him to the drug abuse condition of stimulation. In the third phase, as the victim increases the dosage and frequency, he loses his physical balance and muscular coordination. The addict is now a prisoner of confusion and is fast digging his own grave.
Of course, a teenager threatening suicide, for example, is in a terrible crisis and we as a society must provide humane, compassionate, and wise assistance on an urgent basis. However, we also need to remember that all of humanity -- in its self-destructive adolescence -- is far more similar to that suicidal teen than they are different. Sometimes realizing our commonalities can play a big role in providing empathy. In a way, one can see the label as "crazy," as essentially saying that someone else's behavior or thoughts are simply so non-understandable, so non-predictable, that they are beyond the realm of your imagining why they might do this.