Do you know that most traders and forum users here lies about their dealing in bitcoins. Some exaggerate to their family and friends the unrealistic profit they claim they are making online through bitcoins and these same liers don't tell their losses. Have you ever lied or bragg to your friends about bitcoins.
If we told only the good things we may get with trading then when our friends come to follow our advice and faced the reverse things, we will be blamed by them. It is better to tell them about the risks that may occur at the beginning to avoid problem at the end.