The short answer to sandys OP is that we do not know yet what connection, if any, there is between the murder of the man in the street assault last week and this house burning. On the face of it, it does sound like a revenge attack that has, it would appear, gone wrong in targeting the wrong family.
Such a death is tragic and horrible and senseless.
I too was surprised at NJs quote, which does have a resonance with those obnoxious comments of people like Manning. I really do hope that was not what he meant. I had thought that this notion of "Britishness", or an individuals cultural link as being ethnically or genetically derived had been buried along with the BNP, who loved such a notion. Its a stupid and unscientific notion, and a highly offensive one at that.
"Revenge attacks" are not something you will see more closely linked to one type of ethnicity than others. The instances of revenge attacks amongst just our own, British culture are endless; SP has articulated some of the more high profile ones, but lets not forget a boyfriend who blows up a house in Oldham, killing a baby boy, in an effort to kill his girlfriend following a row. We could even include some lowlife like Dale Creggan who engineered the killing of 2 wpcs as a kind of sick form of a revenge attacks. And revenge attacks are common globally. So lets not keep trying to associate killings for revenge with particular cultures. It has more to do with low self esteem and low intelligence than any kind of ethnic link.
People are conflating what appears to have been a revenge attack gone wrong with "honour killings" - a sick and twisted practice that does have a cultural connection. But that's not really the issue here, at least on the face of it.