I know people are insane and do stuff unscripted but there has to be some motivating factor for committing such an act besides "I woke up this morning, let's arrange my gun cargo and travel to Vegas and kill some people." People unravel sometimes at the drop of a hat but he seemed to have had a decently normal life prior.
What I'm getting at is they pretty much dropped all investigation and have since ignored the ordeal as if it never happened. That's the conspiracy part. They wrote it off as suicide/crazy man shoot people and filed it away 2 days later. Assumptions and things happen after for why did it happen?
As for what you said about people not wanting to face reality I agree. Doesn't events or things just happen? Why does EVERYTHING need to be part of some grand scheme or plan from point A to B to C. I think contrarian views or extreme conspiracy theorists who refute everything have some sort of mental illness trust issues.
What I understand about what creates conspiracy theories is that holes in narratives or stuff government/authorities don't wish to discuss and redact make people think up chunks of narrative to fit into the missing pieces (whether they exist or not). If the government just spoke up every once in a while and admit their failures in events sometimes maybe we'd have less crackpot theories running amok:
CIA: We had information regarding renegade Al Qaeda terrorist cell members in the US prior to 9/11.
FBI: We had information regarding renegade Al Qaeda terrorist cell members in the US prior to 9/11.
CIA and FBI: We didn't share it with each other. This went under our radar.
US Conspiracy Theorists: You losers failed us! You knew and fucked up!
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CIA: .....
FBI: .....
CIA and FBI: ..... Maybe we should've shared information but eh, we didn't.
US Conspiracy Theorists: Why did this happen? There's no motive for a war other being false flagged...maybe the US Government made this attack possible.