These hanging "suicides" by prominent males (and likely many young males) like Robin Williams and Anthony Bourdain are, in my estimation, almost certainly the result of autoerotic asphyxiation. In almost all cases they are found in bathrooms (the most privacy). There are no notes. And nobody had any indication that something is wrong.
In other words, the need to have masturbatory organic experiences is so strong that people end up killing themselves in order to achieve it.
You can bet families do NOT want this to get out. And so they're categorized as suicides in order to minimize the shame, shock and embarrassment.
Many of them are exactly what you describe, but I would not agree they are “almost certainly” that.
People who have decided suicide is the only way oftentimes will do it in ways and locations they are least likely to be interrupted or rescued.
In response to some others in this thread, I never said my plan would stop all, or even most, suicides.