That's all true but largely I think because the worst offenders aren't in the prem. If teams like Cardiff or Millwall get into the top flight I think we might see a lot more of it. The media only really takes that big an interest when a premiership team is involved - as with the West Ham v Millwall thing. But yes, on the whole I agree with you in thinking that, on the whole, the problem is far worse in Italy and Spain right now than it is in the UK. The big difference though is that England has a far stronger culture of fans travelling en masse to watch away games whereas from what I understand fans in the rest of Europe tend to stick either to home games or local derbies. Hence there's far more likelihood in England of fights breaking out in a game between say West Ham and Cardiff than there is between say Napoli and AC Milan.
The problem in terms of English supporters traveling to Europe is that they're still seen as kind of hooligan royalty. I know someone from Italy who tells me the 'ultras' for his team, Juventus, idolise the old West Ham, Manchester United and Chelsea 'crews' from back in the 70s and 80s and so go all out when any of those teams' supporters go over there - which in the case of West Ham is, of course very rare indeed. Although something similar happened to them in the US a couple of years ago when they went over there to play
Columbus Crew.