Mostly I do Kali because it is a fun art to practice, but I appreciate that it doubles as a very effective self-defense system. If I was only focused on SD I wouldn't spend as much time practicing machete dueling as I do, it is certainly an element that is not applicable to living in urban north America. But machete dueling is only a part of the art, it also deals with every combination of weapon system, with an emphasis on unarmed versus weapon. I have run into a bad situation where the other guy was waving a machete around about a block from my house, (I talked that situation the hell down) and I was very glad to have the years of training behind me. Oh and no I don't carry a knife concealed, I carry it openly, clipped in my front pocket, the gun is concealed.