The concerning aspect is always that sober analysis ignores, and scarcely allows for the altered mind states that probably motivate, and thus explain these crimes. In NZ they are regrettably commonplace, statistically.This case may smolder for awhile, and we may see some interesting developments. From all I have read, it seems only remotely possible Henri did not commit this crime. If his relatives wish to keep a scandal subdued, they must keep him subdued. The challenge might substantially elevate household stress levels. What is the protocol when an ax murderer becomes a long-term guest? Should one offer a glib excuse for installing a deadbolt on one's bedroom door, or is it better to say nothing?
It's also possible someone will wake up in the middle of the night and think, "you know, it doesn't seem right that cousin Henri got away with killing his family," and take to social media with their concerns.
The police may be content to bide their time, and let this family live with the project they have taken on.
In simple terms there should be 60 crimes of a similar nature to an NZ crime in US, There should be 5 in SA republic or Australia.