How much did the policing cost? The damage -vs- the resistance? Perhaps abolishing the holiday would save a few thousand CHF, but how much does the taxpayer pay for all those coppers and all that kit?
I'm not condoning the violence, it's abhorant. But abolishing the holiday for the sake of dissuading a few vandals hardly seems sensible. I just about missed the tear gas by not rubbernecking. Plenty of people sitting on the pavement around Helvetiaplatz who were obviously not troublemakers, eyes streaming and lungs tight thanks to the (over-?)zealous firing of gas canisters. Frankly the Police were loving every minute of playing Robocop: they were rude to simple requests, were over-conspicuous and took every opportunity to strut their stuff. I'm not anti-police, but I can understand why certain elements find it a provocation...
It's the same after football games here: the full riot-gear and high-visibility. Should the police behave that way in the Uk outside a stadium, there'd sure to be trouble. Anyway, it was the overbearing police presence which made my friends and I turn home, not the trouble makers.
But a nice atmosphere while it lasted