Gee really???
Yes I would like to run away too, I don't have the delusion that going against a knife is any kind of picnic. (That incidentally is why I have sought out experts in the field to train me, and no one has said that going against a knife is the best course of action.) I train like this for the cases when I can't run away, when I'm backed into a corner, or when I'm with people who can't run away as fast as I can (Grandma, mother, father, wife, sister, etc.)
I DON'T want to face a knife unarmed or ever for that matter, but just in case I also use and carry a knife.... just in case. If running away was the solution to all my problems I wouldn't be in martial arts, I'd be training for track matches.
Lamont