Suicide by gun is more "successful" than many other methodologies.

Cutting yourself with a knife results in your pain overriding your own brain. The innate will to live in our bodies causes us to back off of that kind of pain.

Pills / Poison take a significant amount of time, time that someone can find you and rush you to the hospital and save you.

Guns are often the most reliable suicide. Either shooting yourself, or death-by-cop (attacking a cop, and having them shoot you).

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Yes, suicidal people will find other ways. But we should cut and minimize the "reliable" suicide methodologies. Suicide-by-cop is more successful if you have a gun( without a gun, the cops are more likely to use non-lethal force and bring you in. With a gun, you're absolutely going to die on the street as they light you up).