I can see how it can be confusing: you argue that transit is safe insisting that any crime happening around the transit use is irrelevant. You get mugged walking out of the station because that's where criminals expect solid foot traffic? Not transit fault, even though there is no way to avoid this situation while using transit. On the other hand, convenience stores on gas stations, where most crime is happening against clerks, are making driving dangerous for everyone even though you don't need to visit these stores while driving. I suspect you are emotionally invested in propagating the idea of transit safety and there is no point in further argument, which I only entered out of curiosity about your math.