Well, if statistics show that relatively more second generation somali immigrants do bad stuff than second generation japanese immigrants, that would be an interesting data point.
I live in the balkans... back in the time, there was a lot of crime commited by people from here all over rich european countries, and everyone knew that... the germans/french/swiss/... and we, the balkaners did.
So yeah, considering the amount of somali immigrants and the number of native brits there, and the MP getting killed by a somali, what is it, that makes somalis more likely to do an act of terrorism? Is it something that they 'learned' from their families? Friends? Church/mosque? Why are immigrants overrepresented in crimes like that? Same for us balkaners... why do more Željkos rob banks than Hans's in germany?
This is a thing that should be looked over, and not just ignored, because things like these are not a one-time thing, but have been happening all over europe (and i'm talking about both terrorist attacks by islamists, and mostly money&drugs-related crimes by people from balkans).