I'd be the last person to defend addiction, but let's face it--lots of people do engage in extremely risky behavior, for all kinds of reasons. You ride motorcycles, if I remember right. Some people sky-dive, deep-sea dive, fight fires, fight crime. I wouldn't suggest anyone who does any of those things has a death-wish. But nobody thinks they will be one of the people who dies from it. Still, plenty of people do die from sports or other healthy or beneficial pursuits.
I just don't like to analogize it to committing suicide. If someone really DOES want to die, there are far more efficient ways to go about it.