We discussed this in the Alba household last night and the consensus was the gentleman was acting in self-defence.
If the low-life hadn't been where he wasn't invited, then he deserved it and the police are trying to follow the law.
Hopefully, the CPS will throw this out.
If it ever came to court, the jurors will find him innocent of manslaughter/murder
(unless the jurors are made up of burglars and low-live scum)