I find the legal bias towards Martial arts. Here in Finland sports insurances will often cover ice hockey and soccer, which are at least as injury-prone, but martial arts get lumped together with rock climbing and base jumping and need a special license.

It is true being a martial artist can place you under greater scrutiny in court cases too. Can't say it's entirely baseless - many arts will teach you more ways to harm someone than laymen can imagine. (something I found hilarious when ordered to give a crash course of hand-to-hand combat to my peers in the army - mainly because I had barely started myself!) But in a way I find it unfair.