So, here's the thing. As jks9199 said, if you see it in the news, it's likely not all that common. So, I've no doubt we can find some news articles, but it's in the stats that we actually see how common or rare these things actually are. Regarding the tools such as a taser or pepper spray, sure some training could be wise but how long would it take to become proficiently? 12 years? Regarding the rape stats, we surely do have an issue. The large concentration of young people. The lack of adult supervision. The peer environment. The promotion of excessive drinking and partying. It's a real issue. And, it appears that 12 hours of instruction can make a significant difference. While we do have some information suggesting that this curriculum was effective, I haven't seen any data to suggest that extensive martial training is more effective than, say, crossfit or parkour training in reducing the number of attempted or successful sexual assaults.