IMHO, I may be wrong and I may be right, but I carry a knife as a tool. In the past week I've switched from a Spyderco Native PE to a Benchmade 551 Griptilian PE to a Spyderco Native SE black blade for main EDC, and a Buck Cadet for my backpocket, utility. I would never carry either specifically for self defense, but I would use them in that regard if I had to. I have no training in SD. I sometimes carry a walking stick, bad knees at 26, and I would much rather use that for SD. Other than that, my fists. I live in MD which is a state that does not offer concealed carry permits without a lot of red tape that the average citizen cannot get through, and I'm not proficient with handguns, so until I move out of state and get some learnin', I'm not going to carry a pistol. It is also my opinion that most thieves are not well trained fighters, mostly they are trying to get their fix and are prepared to kill their own mother to get their fix, so the best bet would be to stop them and get away. Unless you are trained in SD, I don't see much reason in carrying a knife strictly for SD.