This story has been totally overblown and has been used by the sorts of people who love to say "This country has gone to the dogs" etc.
A man was stabbed to death, the police obviously have to investigate it and therefore need to arrest the person whilst the investigation takes place. We don't know the facts yet, if they are as has been reported then the guy will get off but I don't mind the police double checking that the story is true rather than just letting him off on his word that he was being burgled.
it's political correctness gone mad tho ennit