Actually, it is flawed. Terraces have nothing to do with violence - retards do. In last years Superclásico, Boca and River fans were throwing chairs at each other from seater areas. Terraces don't make people hit each other, nor do they make or break rivalries. They do create a wonderful atmosphere. Sadly, I doubt fans here can behave either way, sitting or standing. But, violence aside, I feel we, along with Brazil, have the best fan support in the world. Watch a couple matches, I can provide you with some half-decent streams if you wish, and tell me what you think.
Also, and let's not forget the economic side. In Argentina, clubs are owned by socios (which can translate literally as partners, but the most accurate translation would be member), who pay a monthly/yearly fee. By paying that fee, not only do you have access to the club's facilities (not many clubs here are limited to football, most have all other sorts of sports, too), but also most clubs let you go for "free" to watch matches on the standing areas (Known here as "la popular"), and you still have the choice to go to the seater areas ("la platea") by buying a ticket. Of course, if you're not a member, you can also buy tickets for both populares and plateas, the former being way cheaper, which means that pretty much every football fan leaving near the stadium can go watch any and all matches.