Reminds me of the 2017 Las Vegas shooting, which happened under Trump's watch. I suspect that was a false-flag operation by the Deep State with the goal of getting gun confiscation, but it didn't pan out. 

 Yes listen to @MartyBent John Cullen podcast as he also mentions that and another possibility for motive 

Lots of MK Ultra mass shooters who are all on SSRIs too 

 yeah, Martin Bryant had psychiatric diagnoses too i forget what