Be assured that ALL aiki techniques have many "sharp edges" within the principles of the technique.
One of the things I love about aikido is that a well-trained budoka has a choice about the level of lethal force. Of course, many aggressors in self-defence situations injure themselves.
My advice is that if you're in danger, protect yourself to the best of your ability and worry about the rest later. Of course, the more skilled you become, the more responsibility you have for "restraint" and control. My goal is to always "do as little harm as possible."