Kyokushinkai advertises itself as full contact so students almost "sign away" any come back on the instructor.
Same as UFC/boxing/kickboxing they all work on the basis that someone is going to get hurt and fall over, but they to have rules about equipment and strikes
If you advertise your style as "light contact" and run a dojo as a commercial enterprise and someone gets hurt through your negligence you might spend some quality time with the legal profession.
it is a sad reflection on todays nanny state/ litigatious society that we are having this conversation.
Luckily most people who get injured in the dojo take it as part of the territory, but with the rise of MMA and clubs teaching it , I think it's only a question of time before we see a high profile civil/criminal prosecution and any precedent set will effect all us amateur enthusiasts as the insurance companies re-assess the risks. it's a minefield waiting for the wrong student and solicitor to wander in
