The car made it easier for them to drunk drive! Okay, fine, so let's eliminate cars.
If your goal is prevention, there may be something to guns making it easier to commit suicide or that using a gun makes suicide more 'successful' but that isn't all guns are used for. You're isolating a single variable in a multivariate problem. Usually this isn't helpful in finding solutions.
On Afghanistan, you asked for specifics, I provided them and you are ignoring what I had already posted.