Rioting = fun?

Is rioting good fun? I’ve never tried it myself but I hear that they’re rioting in Northern Ireland, something to do with how often they fly flags. A decision made by democratically elected local government, it’s said. Their own leaders have told the rioters to stop, but continues today.
In NI, have a long record of extreme action triggered by trivial, silly issues- flags, parades, marches and so on.
So with such absurd causes, what is the real reason for that behaviour?