That "game" was indeed the spark that ignited the tinderbox ex-Yugoslavia already was at that time.
The Old-Firm is a different game, it's also about religion, but luckily with less bloodshed. But there are more derbies in the world that divide a city or a nation. Like in Buenos Aires, Argentina, where Boca Juniors and River Plate supporters can drink each others blood. And Lazio Roma - AS Roma, can have some pretty insane scenes from outside the stadium... Derbies need to be fun, and have rivalry of course, but no fighting