I did not say anything about “no prior planning or thought or preparation.” Indeed, many, if not most, suicides involve prior planning. Suicidal ideation is not itself impulsive in most cases; it is a lasting and ongoing thing. Few people suddenly decide to die out of the blue. In fact, having a plan in place is a major risk factor for suicide, which sounds kind of like a no-brainer.
But where impulse comes into play is at the moment of decision. (And really, “impulse” is a poor word choice, particularly since “impulsivity” is a term of art in the psychological field. Apologies.) The time between making the decision to attempt suicide and the actual attempt is very often quite short. There is an acute period of heightened suicide risk that is rarely more than hours long and most often measured in minutes.
Not sure if you have access to these, but more depth is found in:
Hawton K. Restricting access to methods of suicide. Crisis. 2007;28 (S1):4-9.
Simon, T.R., Swann, A.C., Powell, K.E., Potter, L.B., Kresnow, M., and O’Carroll, P.W. Characteristics of Impulsive Suicide Attempts and Attempters. SLTB. 2001; 32(supp):49-59.
Deisenhammer EA, Ing CM, Strauss R, et al. The duration of the suicidal process: how much time is left for intervention between consideration and accomplishment of a suicide attempt? J Clin Psychiatry. 2009;70(1):19-24.
My point is that in many cases, if not most, the direct impulse to act on suicidal thought is acute and brief. When it occurs, plan or no, the easiest route is, well, easiest. And it doesn’t get much easier than a firearm.
Thanks. How many of those defensive uses are ones in which, as you say, “guns are used to thwart crime where no shots are fired and nobody is injured?”