It's so difficult to really know anything from statistics. In years gone by, I assume it was far more common for the local sheriff to write up murder/suicides as accidents (for the sake of extended family honour etc).
Do you include the guy in his 90's, who's wife has very late stage cancer stirring something into the teapot and making sure they go out together?
Statistically that's an extremely violent act.
A friend of mine worked as a prison guard for many years and told me that drug dealers, arsonists and thieves look like drug dealers, arsonists and thieves; but murderers just look like normal, regular people. Maybe the professional murderers are better at not getting caught.
I'm personally more comfortable with the idea of killing somebody than I've been in the past. Maybe that's being a Dad; but if somebody's clearly abusing their existence privileges and represents a clear, even distant threat to my family I don't think I'd feel much trauma or regret storing them underground for safe keeping.
On the flipside, I'm far less likely than ever to just snap and kill somebody in anger.
Finland has always had a high suicide rate, to the point it is a cultural meme. However, over the last decades, it has shifted toward murder-suicide too. The suicide was loneliness - the murder-suicide is "passion" - it isn't passion of course, it is an inability to control negative emotions due to unmet expectations.
I think this is because you have clear values that you have thought upon and live by. Do you think that is the same for most people? Most have lip-service at best, but I reckon most are on autopilot and that means, the default is what they have been conditioned to do - which is get triggered and show their emotions unreservedly.