It is important that someone who studies the use of a blade as a weapon, realizes that in the event they, in fact, do so, they have opened the door to a very dark place. There are grave psychological and legal ramifications to blade use in combat, especially by civilians.
Knowing these ramifications is every bit as important as knowing the proper use of a bladed implement.
Always carry what you preach 1.
Always carry what you preach 2.