Hope it's okay to begin a new thread on this topic - it's something I think about on occasion - more so today as I'm home from work, hungry, and supposed to be pondering all the wrongs I've done over the past year...
The question is essentially this: What are the consequences of the mindset that we try to cultivate? Or, more obviously, the results on oneself of injuring or killing another human being, regardless of the provocation or necessity. I raise the question not with an eye to debating the necessity of developing an appropriate mindset, (which I do believe is an essential aspect of self defense) but rather to challenge the notion that developing this necessary attitude comes without a cost.
Grossman, in his book, "On Killing" posits that human beings have a natural reluctance to kill one another, a reluctance which needs to be overcome by fairly sophisticated psychological means in order to develop soldiers who will be willing to kill the enemy. It is probably not unreasonably to assume that the process by which one develops the mindset appropriate to self defense may be similar (I am ignoring, for these purposes the issue of "authority" which Grossman discusses at some length), and may pose similar problems after the fact. Pretty much everyone is familiar in the wake of the Vietnam War of the effects of Post Traumatic Stress Disorder - at least in its most dramatic forms. I would be interested to hear from folks who have had to injure or kill in self defense about what, if any, the lingering after effects are. On a more subtle note, I wonder too if this same phenomenon occurs to a lesser degree just by the process of developing mindset. We are probably all familiar with the "cold, hard killer" character in the movies. It is probably only more recently that we have seen some movies portraying the seemy underside of these characters sometimes seeing them going home to empty houses, unable to get close to anyone... (they used to just 'ride off into the sunset').
After all that rambling, I suppose the question I am posing is this: at what point does one's preparation for defending oneself or one's family become "detrimental" to oneself in some way? Although I think, ultimately this will be a question each of us will answer personally, and each of us strike our own personal balance in this, I would be interested to hear from folks about this subject.