Krav Maga has most of its self defence drills with the "victim's" eyes closed, then he or she is attacked from any side, not neccesserily from the front. We will often do drills where we turn out all the lights, turn on a strobe light and blast music to simulate a nightclub where hearing and visibility is limited, so I can say we kind of go "by feel" as well. From what most people seem to know about Krav Maga is what they have seen in videos. I think trying to get a clear picture of ANY fighting skill by watching a video or reading a book is difficult at best. Before I began KM training, yes I was shown a video but then had to watch a class, then the next day took a 2 hour class one on one with the instructor before deciding to sign up. As far as the techniques they use on edged weaopons/firearms, I think most would agree that alot of techniques used by various MA can be considered dangerous. When confronted with deadly force, the situation is grave. I would say that watching videos doesnt always give a clear enough picture of the technique that is being used, it is better to have your potential instructor show you first hand what technique is used. If you ont agree with their system of disarming you could always not use it and use another. I have found that over the years alot of different MA schools teach different tactics some I use and others I drop because I dont agree with it.