If they are his friends, they might not really care what your side is. They'll support him whether they agree with it or not. Same as how your friends will support you.
I think if he has a close older/experienced friend who he looks up to that you told, it might work, but as a whole it might not do much good. I know in the beginning you want to tell everyone who will listen in the hopes of them changing him, but in the end they don't because they don't want to get sucked into the drama. This definitely happened in my sitch and a few others.
I think in the beginning I actually alienated some people because of it.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.