Matches of the now defunct DWW is a bit of a cheat as it's not easy to discern the animosity comes from being that competitive, it's part of their personality, or a much larger picture. These videos were made at a time before the former Eastern Bloc's ascension to the EU, so unlike today, people back then scurried away from the former Soviets. There are so many frozen conflicts guaranteeing discord between neighboring nations that kids from a young age are groomed to treat certain other groups with disdain. Throw in a woman from Ukraine, whose family more likely than not took part in occupying the countries of the other athletes, and pray it doesn't turn out to be a "Blood in the water" match from the Melbourne Olympics.
To reflect on your original point, shoot matches are my favorite in the sense they involve a real stake (like running a promotion) and the full extent of their skills.