Now the Argentina Mexico match was what it's all about, producing matches like that. The kind of matches that makes you sorry there has to be a loser

The Germany Sweden open on the other hand I couldn't keep my eyes awake.   

And of course they both had daft refereeing decisions, which balanced out - eg a perfectly valid Argentine goal was ruled out for an offside that wasn't. Swings and roundabouts.

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It was good seing the Mexican and Argentine spectators mingled in together, and no trouble.   I think segregating fans as a way of reducing violence, either at the grounds or elsewhere, may well have the reverse effect, generating confrontation rather than defusing it.