I'd be interested to know that if the person in question was a white catholic, and asked for a Union Jack, whether everyone would still be using the term "terrorist"? To me, it's a term that is far too over-used in modern day vernacular, and is a favorite buzzword for the commercial media (News Corps et al). The guy was a nutter, and that's about the size of it.
You are a nutter, I used to think you might nearly have been a worthy debating partner, but lately I have come to realise this is not the case.
A white catholic? When making a point in a debate it's pretty important to not give your opponent an obvious free kick... This might come as some news to you, but there was this group of people, mostly white, mostly catholic, called the IRA, they were/are near universally regarded as terrorists. Perhaps you might like to read about Bloody Sunday, or listen to some Corrs music and watch Michael Collins since I now gather you're a popular culture kind of guy...
I recall a slightly less catholic, but still catholic, nonetheless equally white person, perhaps you've heard of someone called Timothy McVeigh... - Terrrorist.
In case you've not noticed, the Union Jack is typically regarded as a national flag, the Isis flag, and Isis in general is something just a tad, well let's be honest, not even close to the same thing.