So then you are speculating.
Not sure that answers my question
No.
Ah, George...... in your post 1 you wrote:-
Is there some reason why we keep producing mass murderers?
I asked you 'Did the murderer get the gun illegally?'
...and I'm not sure that you answered my question, either?
There we go, you and I, not sure that we get our questions answered.
How bad? How has it changed?
Well, before tightening of gun laws here there were lots of mass shootings.
After gun laws were tightened they went away.
My point has been (all along in this thread) that a % of human beings are going to be murderers, and a very small % will be mass murderers if they can. If you are happy with the levels of crime reduction and deterrence in your State (?) and Country, then 'OK'. If not it is you who should be trying to answer questions, not me.