I've been thinking about martial arts and how really it is useful these days since a lot of places will have criminals hiding firearms or in the U.S. some states have conceal carry.
Whilst it contains discipline and it is enjoyable to train in a club for, say Karate, I just think it might not be that useful in places where firearms are commonly held, all it really takes is for someone to take safety off, aim, pew pew and that's it.
I suppose I probably get this thinking from kung fu where it's seen more of an art form then actually being a serious bone breaking form of combat
Brazilian jiu jitsu is basically the only credible form of what most people mean when they say "martial arts" (meaning Asian origin with some kind of progression, often with belts).
China is so salty that karate can't survive the age of the Internet they are blackballing it's critics.
Search for "bullshido" if you want some egregious examples
Rule against hitting the groin or gouging someone's eyes. There are lots of combat styles that are more efficient than Jiu-Jitsu, but they're not for competing, they're for survival.
I used to train some of the less savoury martial arts, and ever so often we had people from the Jiu-Jitsu class wanting to train with us because they saw us doing "wrong things" and wanted to "teach us". What they discovered very quickly is that lots of Jiu-Jitsu positions put you in a very vulnerable spot if your opponent knows and can use pressure points, including groin and eyes, and that the "wrong" things we were doing might open a counter attack but prevented those things.
I'm not saying BJJ is bad, but it's not the br all end all that people claim it to be.