I suspect part of the problem is that a significant section of Ingerlund fans just aren't used to travelling to support their team.
If travelling England fans were composed mainly of fans of the top Premier League teams, I doubt there'd be as much trouble.
Because many fans of the big league clubs have learnt how to cope abroad, they know what they can and can't get away with, and they just get on with it. But a fair proportion of those fans either don't follow England or have already had their wallets emptied by the Premier League.
Whereas loads of England fans hardly ever go to big games except internationals, and usually only to home internationals. Tournaments are their two-yearly jolly-ups. They're the sort who have clubs like Colchester, MK Dons and Torquay as their local clubs, they go and get tanked up in these foreign towns, aren't at all prepared for being pushed around by police with tear gas and tasers, and are also astoundingly stupid.