Which leagues send players off most?

Red cards per match. The answer is a continent, not a country.

Liga Profesional Argentina (Argentine) sends players off more often than any other: 0,183 red cards a match.

Showing the major competitions. Include every competition

Second yellows count as the red they produce, exactly as the provider records them. Cups are left out: a cup draws an amateur side against a champion, which is a different game.