"Psychosis" is a real word with real meaning. It's frustrating when people use it as a slang word because that use stigmatises people with mental health problems.
It's possible that someone in a spree shooting has never had a psychotic episode and was not psychotic when they were shooting.
(https://www.nlm.nih.gov/medlineplus/ency/article/001553.htm)
Psychotic episodes are not just caused by mental illness. They can be a symptom of other illnesses - Brain diseases, such as Parkinson's disease, Huntington's disease; Brain tumors or cysts; HIV and other infections that affect the brain; Some types of epilepsy; or Stroke.
(It's a shame that 'psychotic' is similar to 'psychopathic'. And that most people have almost no understanding of either condition.)
> The same applies to drone warfare. It’s suddenly so much easier to pull the trigger, and you’re not putting any of your own people at risk. And so more people die.
The military kills people. We stopped caring whether those people were civilians during WWII. Our military kills people with a variety of weapons. Shock and awe didn't feel particularly targeted. The cluster bombs that kill and maim hundreds of people each year don't feel particularly targeted. Cluster bombs are currently illegal, but the US and Britain have been trying to get the ban over-turned.
I don't understand why drones, as a weapon of war, are getting so much attention at the moment compared to other weapons of war. Dead civilians are dead whether they're killed by drones or landmines or cluster bomblets or whatever.