The first thing is that things anything like this should not happen to anyone - let alone someone simply travelling to watch a footy match. Second, tarring all Italians as thugs &/or cowards is somewhat extreme...I know some Italians who are neither, & believe me - you wouldn't want to upset them...Thirdly, it is still a likely throw back to the "proud" reputation abroad built by Britons either in connection with travelling to/from football games mostly in years long past (but still current too, I'll bet - but our press just do not report it so much, just like at games here in the UK) - OR the drunken loutish behaviour unashamedly promoted on TV programmes.
None of this excuses it, but I just think we need a sea of change in how we collectively behave abroad before we're collectively welcomed...although these are still probably relatively rare occurrences overall.