I wonder how much fatalism culture plays into it, meaning basically "life is shit" and suicide memes. I'm not sure if they even encourage discussion or just put those kind of thoughts into the heads of people more. I don't really been able to articulate it but self deprecation/depression humor seems more popular in recent years, at least on the internet, and I think it's a bane more than a boon.
Not saying it's the sole cause of the increase in the suicide rate but I think it plays a role.
edit: I guess all that is just based on a general lack of hope in the future. which is bigger than just shitty jokes.
I'd like to here others thoughts on what they think is the reason for such a large increase