Using a tactical knife for self defense.
notice how many knives have ominous sounding names , maybe a skull lanyard or etching..
"Ladies and gentlemen of the jury , the defendant used his ( pick one ) Air Wolfe , Battle Cry , California Cobra , Apparition , Nighthawk , Special Forces Combo , Retribution , Extreme military fighter , AK47 , Black Talon , Recon 1 - "
Imagine your knife is one of those 'evil' autos or A/O's , maybe its got some tactical camo tiger striping and a blood groove , or a skull crusher !
My Heavens....
Just some food for thought
That said , if I feel the need for a SD knife I always go for one of mine that is best suited for such a purpose.