http://tva.sagepub.com/content/5/1/21.short
if you dissociate from your surroundings, or from your actions, what would normally set off red flags doesn't. you can, in a way, voluntarily dissociate yourself from your actions. i used the gun as an example but there are others.
and there are degrees of dissociation. i'm not saying having a gun means you view people as pixels or something. but in more extremes cases caused by trauma, you have PTSD sufferers beating their spouses or killing them, in less severe, more voluntary cases, you have a neighborhood watch individual killing a kid he would likely have not confronted had he not been armed.
i mean, even if you disagree with dissociative behvior, you can't deny there's a worrisome segment of gun owners who think gun=guaranteed protection, as opposed to merely being an opportunity of protection. that alone is dissociative thinking.