This will prove unpopular here most likely, but a robust public health system that includes psychological services would greatly diminish the number of mass shooters in the US.
By implementing robust public mental health programs that focus on early identification, intervention, and support, communities can help identify potential psychopaths and reduce the number of mass shootings. It is important to note that not all individuals with psychopathy or other mental health conditions will engage in violent acts; however, providing comprehensive support and services can help mitigate risk factors and create safer communities for everyone.
Killing a human being is not an easy thing to do from a mental standpoint. It goes against human nature at its core. You have got to be seriously messed up to go through with a killing, if not threatened yourself. In war or self defense different things are at work.
It is written about in medieval works such as “The Song of Roland," a medieval epic poem based on the Battle of Roncevaux Pass in 778. In this poem, there are descriptions of the emotional and physical distress experienced by the soldiers after the battle. There are many other writings that show the stresses warriors go through.
People that are capable of murder like these mass shooters have severe issues, they’re literally sociopaths as well.