[jonhendry18]

Knife, rope, car accident, drug overdose are significantly less likely to be successful than a gunshot. They also take longer, and the longer it takes, the longer the person has to reconsider.

Also, you don't often see a knife, rope, car, drug overdose, skydiving, or assisted suicide used in a murder-suicide scenario. (Murder-suicide by car certainly happens, but not as often as with a gun.)