WARNING: This contains a bit of bad language.
We see the same phenomenon in the Martial Arts. These are the individuals who go to bars looking for a fight. All tattoos and abs. All technique and strength but very little brain. The truly dangerous guy is the 75 year old retired Art professor who is legally blind without his contacts and looks kind of round and out of shape; but is, in fact, a master who can kill a man by literally flicking his wrist, hitting the exact right place, with the exact right hand angle, with the exact right amount of force.
To be truly dangerous, one must have patience, discipline and a sound moral compass. Skill and strength are important secondary traits. I find the same to be true with a bo, sword, knife or gun.
~ Shihan Jakle