Anybody can kill anybody...

"Anybody can kill anybody, it's no great shakes. You can train for 40 years and a kid with a handgun can kill you. The real essence of what I believe is to live your life like a man. If your martial art teaches you how to kill and beat people up, then buy a shotgun and a pitbull, you are the toughest guy in your neighborhood"

(Bud Malmstrom, 10th Dan Bujinkan)
http://www.bujinkanatl.com/about-bud.html