It seems that this is happening more regularly this season.
I thought that, after Hillsborough, this was regarded as a line not be crossed. Perimeter fences removed as a result of tragedy meaning that there was effectively a duty of care imposed on fans not to do things that could lead to a re-imposition?
The only external factor is the increased surveillance of the crowd meaning that trouble-makers could be identified.
I really, really hope that this is stamped out by the law-abiding vast majority of fans as we don’t want to (and can’t) go down the ‘pens’ route again.
If the clubs can’t have perimeter fences, and people keep invading the pitch, the only alternative (eventually) will be to stop games and play a the remainder of the match behind closed doors (keeping the score-line the same so fans don’t have the ‘nuclear option’ of invading the pitch when their team is going to lose.