Guns are usually instantly fatal and available in the home.

Overdosing is dangerous, but it's less lethal than gunshot.

Falls from high places are dangerous, but it requires the person makes a plan to travel to that location which doesn't fit for the rapid onset nature of many suicide attempts. Death by falls and fracture (these include jumping in front of trains) account for a small number of deaths by suicide. So, people can do it. But they tend not to do it. https://www.ons.gov.uk/peoplepopulationandcommunity/birthsde...

No, you don't need a gun, but it makes it a hell of a lot easier, and the extra effort involved to do it without a gun often stops people.

> they all agree that at home, you should store your guns in a locked container

And how is that working for them?