If everyone has the right to own a firearm, this means that it will be easier for criminals to own firearms. So what's the point if people have firearms but criminals also have firearms? This would be dangerous and worsen the chaos. Moreover, if criminals have firearms, they will be braver and more sadistic in committing criminal acts.
Let's take it from the US which has regulations regarding firearms which in my opinion are not too strict.
Graph of firearm deaths in the US, 1999 - 2021.
Suicide → Suicide
Homicide → Murder, criminal act. Varies, such as hitman, robbery, etc.
So in my opinion everyone has the right to own a firearm, but it must be subject to strict regulations and proven by psychological tests. That will reduce the risks as I mentioned above.