I... don't see how making someone feel silly is going to help in the long run? If it really is a problem for them, then wouldn't they have a harder time bouncing back from thinking they've said something silly/stupid, not to mention feel alienated and alone, possibly discouraging them from talking about it again instead of doing the deed? It seems to me that an expression of suicidal intent as a cry for help doesn't necessarily make it insincere. It doesn't sound unlikely to me that someone could say they've the intent to do it, because their view of how things are makes it seem like life's not worth it, but that they'd of course want to think otherwise, and so would still like to hear serious advice on the matter, or at least hear that someone cares. Honestly, it sounds very callous.