"We can academically discuss these topics forever (we already have to an extent), but unless this somehow leads to a high degree of success in identifying these types of people BEFORE they kill, it's just that -- academic."
It is all about control.
It is easy to identify people that are "off", by how much they need to control other things. People like Police, Politicians, bureaucrats, administrators, company mid level managers, are good examples of legal nut cases.
Where to worry is the less visible insecure nutcases. Those we know about but can't do anything about. I know people, I won't sell guns to, because they're nuts.
We used to live in a free society and the price of that is, someone will sell or allow that nutcase to get a gun. So it isn't academic, it is a fact of life.
Arm yourselves accordingly.

There have been some wild assertions in this thread, but I think instead of trying to argue, I'd rather just "add to the pot" at this point.
Professions like law-enforcement, the military, law, business, and even medicine are particularly attractive to those with psychopathic traits. Think of a police officer or soldier who "shoots first and asks questions later", or a defense attorney who is defending a serial offender and gloats they got someone off of a murder charge, or a corporate "hostile takeover" specialist who destroys a company for a quick profit, or the infamous "gain of function" research that may have led to the creation of COVID-19.
Not every psychopath is a Dahmer-esque serial killer. That's just stuff for the movies. In fact, neuroscience tells us that people with psychopathic brains are different and that the anti-social classification no longer applies to all those with suspected psychopathy. This is why not every psychopath has ASPD and not everyone with ASPD is a psychopath. Pro-social psychopaths are basically those "serial killers" who engage in "legal killings" and blend in with society, rather than completely rejecting it.
A good friend of mine is a psychologist, and her favorite joke is "1 in 4 Adults has a diagnosable mental illness. Think of your 3 best friends. If it's not them, it's you". The fact is, lots of people have mental illnesses and the fields of psychology and psychiatry are very, very different.