Here's yet another theory about the Las Vegas massacre: It could have been drug related, as in SSRIs and other psychotropic drugs. Add this to the other two plausible motivations: jihad and politics. (Of course it's also possible he was just a psychopath, but then the questions remain, why this country music concert, and why now?)
Author John Ringo's personal experience with psychotropic drug reactions is amazing. He posted this on FB today. Read the whole thing, but here is a taste:
Miriam [my wife] is a 'limited case pharmacological phenotype.' What does that mean? You know where on the warning label it says: 'in rare cases may cause you to grow two heads and fly to the moon'? Miriam is 'rare cases.' Every single time she tries a new prescription drug (fill in reason here) she is 'rare cases.'
We don't know at this time if the shooter was on any of these drugs, but if he was it would explain an awful lot. Unfortunately, our HIPAA privacy laws make it impossible to obtain medical records and do accurate research on this subject, even after a shooter is dead! This must change.This involves the 'in rare cases' effect of a drug called Cymbalta. Notably, as Cymbalta NOW states 'in rare cases may cause homicidal or suicidal psychotic break. Should not be prescribed to teenagers.' (Because it turns out in MOST cases WILL cause psychotic break in teenagers.)
Remember, there was a time in this country when everyone had a gun, and yet mass shootings were never a thing. Only since the introduction of mass-marketed psychotropic drugs has this mass shooting phenomenon metastasized.
Here's an article from 2013 correlating SSRIs and other psychotropics with just about every mass shooting up to that point.
Here's the list from that article: