First, this sucks and no one deserves that. Bad [Bleeeeep!] sometimes happens and there is nothing you can do about it.

That said, it sounds like he CHOSE to be friends with them. He CHOSE to be friends with junkies that have repeatedly stolen things. So much so that they've actually been caught numerous times. The burglary is a direct result of his choice to associate with these people.

Good luck with the fallout and don't get shot by these shitbags that now have more guns than ever.