Is it possible that someone coerced the Vegas shooter to do it?

I'm not usually one to cry conspiracy, but something really doesn't add up here. This guy doesn't fit the usual description of a rampage killer at all. Most are frustrated young males with a mental health history, angry political activists, or religious nuts doing it for political purposes.

This guy was wealthy, upper middle aged, had lived a good life, and didn't seem at all weird to people who knew him. This attack also took a very high level of planning, which implies the shooter still had his mental wits to some extent.

What if some group or individual had some kind of terrible leverage against him and forced him to do this? Maybe they had somebody important to him and threatened to torture the person and send him a piece every month unless he did this?