There is no silver bullet
There is no perfect magic shield for protecting against suicide. I'm sorry but that's the truth. I know a lot of people know this and I may be preaching to the choir a bit, but I needed to say it. I know a lot of good intention-ed people who wonder why so and so committed suicide. They seemed happy. They had a good job. They had a wonderful spouse. Beautiful family. They had purpose. They had faith, you could feel it, they were active in their church. All of these can mitigate suicide, and for many may be enough to hold on. But that doesn't mean it's true for everyone. Our thoughts are tricky tricky beasts. They can take us down a rabbit hole in no time flat. I can tell you from experience that one negative thought can snowball, and cause a string of catastrophizing that will rob one of all sleep in a night. It can happen to any of us. That much is true. That brain of ours is not infallible, it's susceptible to all kinds of trickery. Thoughts need to be active.