(Probably because they do that everywhere and on drugs they even worse) Honestly i don't know but it happened on crystal matrix anniversary when crazy astronaut was playing 3 or 4 cars where completely ransacked and 1 guy had to go by ambulance to the hospital cause he was completely beat up by a group of 10/20.
And yes dnb parties in portugal are also full of fights and thefts even the own security guards won't do nothing if they see it. But it all depends on the entry price since most of these guys that go to start trouble won't pay a 50 euro entry ticket.