Male violence, towards women and in general, is a massive problem, and a worry for mothers of sons who are trying to bring up decent young men, but are faced with the onslaught of the sort of rhetoric of violence on social media. And the influence of porn which is about the exploitation of women for men's pleasure.
We will never know what motivated this man, but we do know he was granted a gun licence. What exactly was he granted this for? Why does anyone need a gun? I live in a farming area, and many here have guns for eliminating vermin, but any one of them could use it in an evil way. I know that licences go to very dodgy people - the checks are pretty cursory - mates endorse mates on the forms. There needs to be a serious look at the system that allows this.
Mostly men committing violence towards women do not kill themselves - they have too high an opinion of themselves to think the world can do without them. So we have to wonder about the mental health of this man.
The information about a previous incident is not about victim blaming, but it does highlight an unstable relationship and reveal that there is some history here that might be relevant to the incident.