It is different but that doesn't mean you're not overestimating the organisation of a bunch of drunk thugs.
FFS NS - wake up. This isn't a bunch of people stumbling out of a pub at closing time pissed and having a fight or deciding on the spur of the moment to put a brick through the window of a a building across the road which just happened to be a mosque or the office of an immigration laywer.
Nope this is way more organised. Derek Drummond, who was sentenced to 3 years yesterday is from Liverpool. He decided to travel to Southport, some 20 miles away to take part in the distubances. That was both a deliberate decision on his part and was presumably triggered by information about planned disturbances and (likely) false information about the nature of the Southport attacker.
He didn't stumble out of a pub close to home and by some time-warp find himself in Southport confronting the police.
You are worryingly underestimating the levels of organisational ability that can be achieved via social media through groups of like minded people. Think flash-mob intent on violence, not drunken pissheads stumbling out of a pub.