How many more incidents like this need to come to light, before punishments become serious?
There will be some wank excuse by UEFA / the FA / whoever, that as these incidents did not take place in the football stadium, this is a matter only for the police. Well fuck right off.
The only way this can really be controlled, is by society - in this case, other fans of the club - stamping it out of their support and showing the culprits that this is not acceptable behaviour. We can't have 1000s of police officers at each and every game controlling everyone. And in order to motivate those others to control this, there needs to be an incentive, e.g. collective punishment if a "minority" of supporters are found to behaved in such a way.
At the same time, while it annoys me to say so, someone like Dele Alli, needs to have the book thrown at him. Can't be selective about who to punish. Seemingly in the current climate we need radikal action to stamp this out.