The idea behind resharing it is basically to grab someone's attention who is contemplating self-harm and redirect them. The number is always available, but from the sound of it, someone about to commit self-harm is often feeling hopeless, alone, and has severe tunnel vision. So you have to get the offer of help right in front of them. This is why the number is posted all over bridges.
It's also allegedly a very acute thing. Many individuals contemplating self-harm, I am told, don't really want to, and are in that vulnerable moment only briefly, maybe only ever a few times. So helping them is truly possible.
I can absolutely second the "tunnel vision" aspect of that state of mind. the more you put this number and other resources in front of people, the more likely it is to sleep into that tunnel.
It's also allegedly a very acute thing. Many individuals contemplating self-harm, I am told, don't really want to, and are in that vulnerable moment only briefly, maybe only ever a few times. So helping them is truly possible.