This picture tweeted by The Academy (Oscars) about Robin Williams is beyond poignant:

[jeff47]

64. No, what I'm trying to get you to do is understand what depression really is

Because if you don't understand what it's actually like, you won't be nearly as good at helping with it. And if you have the misfortune of stumbling into it yourself, understanding it can greatly shorten how long you suffer.

And quoting additional experts doesn't change that those experts are still talking about different people than we are talking about.

Instead of searching for experts to try and "win", try understanding instead. Chances are at least one of your friends or family are suffering from clinical depression, and you could be an enormous help to them. But only if you understand what they are actually going through instead of the caricature you currently have. Thinking they would kill themselves because a still from a cartoon can possibly be twisted into encouraging suicide isn't going to help them. Neither are common platitudes like "you are not alone" - depressed people think they should be alone because they think they are worthless.