Poor example. 

The Troubles in Northern Ireland was/is a political conflict not a religious conflict - the politics just happened to split along religious lines.  No credible person would claim to be able to trace the licence for such violence back to the Christian texts. The same can not be said for the Islamic religious texts - quran, hadith - which explicitly provide license for the sort of thing we saw in Berlin today.

See where I'm going with this and why these two things are different?