That's not a re-phrase, that's completely different from your first point.
How can you kick someone out of their own country? If he was born in Britain, then he's British. End of. Your statement was right out of a Britain First slogan, and it's one that doesn't belong any where in any form.
The thing is Dip, you're saying all this without knowing the motivation behind the attack.
Maybe the Army cadet was banging the other guys missus? (Bit of a stretch at 15 I agree). Just because it was one ethnicity against another does not mean it was a politically motivated attack.