On air at 17&18GMT: Pride and its limits
In Scotland, we're seeing a related discussion after the revelation that parcel bombs have been sent to Celtic manager Neil Lennon and two high profile supporters.
This is just the latest symptom of a problem that reaches back decades in the history of Scotland's two biggest football clubs. Rangers and Celtic have huge and passionate followings and as such are no different to many big clubs around the world. But both sets of fans on occasions will sing sectarian songs that evoke far more than football (you'll see here Rangers ).
Though this is not precise, Celtic draws its support from the descendants of Irish Catholics who emigrated to Scotland after the Great Famine and from across Ireland, Rangers from Scotland's mainly Protestant community and from Unionist communities in Northern Ireland.
Both sets of fans say their expressions of identity through songs and flags celebrate their culture and past rather than advocate violence against their rivals. But they divide on whether all songs are acceptable.
We'll discuss where pride reaches its limits.