Most people live in denial that they will die, even though, rationally, they know it will happen. However, the emotional side cannot fully feel this finitude. When someone reveals their intention to commit suicide, that person ends up reminding others of their mortality ,and the fear that arises is even greater, because, from a common point of view, death is seen as the worst of evils. So why would anyone choose death voluntarily? I believe this is why many tend to distance themselves from those who talk about suicide: it touches on something that no one wants to look at and is the only certainty in life: death.