Just to follow up, this video fills in the gaps from the beginning of the fights in the crowd. The game ended, then Colombian fans in general threw their drinks in the air in celebration (note that the crowd is all mixed together, so the entire narrative of "Colombians threw their drinks at the Uruguayans" already doesn't make sense, because drinks thrown upwards would hit more Colombians than Uruguayans, beside the point that Uruguayan federation people threw drinks directly at Colombians) and otherwise celebrated (some surely saying things a bit over the line). From this point, a group of violent Uruguayans started attacking Colombians. One of the Uruguayans you can see in the group that started everything is shown very clearly in the broadcast videos punching somebody in the back of the head and backing away to hide.
This was very, very clearly entirely the fault of Uruguayan fans, players, and directors. They were explicitly the aggressors in every single flare up in this. Keep in mind that even if you didn't have the videos, Colombians were not the angry ones when all this started, and the videos all back that up 100 percent. Unfortunately, a "both sides" narrative has combined with a provably false "defending their families" narrative in the Spanish language media, and English language media are going all the way in defending Uruguay because of a certain RS player being front and center in all of it.