I receive annual suicide awareness training at work. One of the things they train us to do is, if we suspect someone might be considering suicide, to ask point-blank: "Are you thinking about hurting yourself." Most people will answer honestly, and then you can get them help if they need it. So while discussing suicide in the abstract can trigger others to commit suicide, discussing it directly with a potentially suicidal person is a critical first step in preventing suicide. Also, most people don't know what to do when dealing with someone suicidal, and the only way to teach them is to talk about it, which creates a bit of a catch-22 when you combine that with the Werther effect.