Why / How will a person die ?
- old age,
- illness,
- accidental trauma,
- accidental violence,
- wanton/criminal violence.
Old age is something we're all accustomed with, and we will mourn friends & family, but accept death as a "passage beyond".
Illness is also something we're all accustomed with, and we will do our best to find a cure to anything which may happen, yet are also aware that it is still possible, in this day and age, that people may die through illness. We will mourn them too, and pray/hope/work towards finding a cure.
Accidental trauma is when the little boy falls out of his treehouse, loses control of his bike and lams into a lightpost or drowns in the swimming pool; or when we end up looking at the underside of another vehicle.
These bad things should not happen, but they dom and we try our best to create rules to ensure they will not happen again.
We mourn those who fell victim to these accidents and pray for them, but accept fatality.
Accidental violence is when we quarrel and fight over something which may appear important at the time, and sometimes is, but the immediate consequences are someone hitting his head or falling over etc., and the coroner has to come and inspect.
I believe the definition may be "manslaughter", I may be wrong here.
We mourn the dead, try the "attacker", who is often released as it was self defense, or who may be sentenced because the "accident" was disproportionate to the initial provocation.
Wanton violence is what we all abhor, and it is against wanton violence that we should work together.
There were just as many murders in
Victorian London as there are today in many modern metropoles. Yet there were precious few guns, and all these murders were by knife.
Remember "Jack the Ripper"? Anybody ever proposed to ban knives? Hunting Knives?
Anybody ever hunt by knife?

Anybody ever considered banning
Kitchen knives?
The only acceptable reaction is to ensure that :
a) guns don't fall in the hands of the unreliable,
b) only once a person is certified as "trained" may a gun be purchased,
c) guns should be registered as you would register a car, i.e. registered with the local Sheriff.
"Holocaust" scenarios where a mad mayor/governor goes on rampage and impounds all firearms is simply not an acceptable scenario in the US, because of your cultural and historical background.
The US are NOT a feudal country gone modern, the US were BORN modern in 1776.