Yes, it is the simplest theory but when I think about it, Vegas has to be one of the toughest cities to commit suicide in and disappear at the same time. True, a lot of suicides take place, specifically in the hotels and "pay by the hour" motels downtown. But, those people are eventually found and identified.
But, to commit suicide AND disappear, that is something different. Think about Vegas: There are no bridges to jump off of. There are no waterways to jump into. There are no forests or woods, except for Mt. Charleston which is like an hour and a half from where Steven parked his car.
I think about my hometown city, Pittsburgh. It would be about 10,000 times easier to commit suicide there than in Las Vegas. You could park in a garage downtown. Walk to one of the city's many bridges and jump. The fast Ohio River would take you downstream so far that you'd be miles away before anyone knew you were gone.
Do we really believe he just walked out into the desert? It's the only suicide plan left. And I will say again, heading down Evening Lights was the opposite direction of the way he needed to go to get to the desert the quickest. And what did he do once he got to the desert? Shoot himself. Did he use a gun before? Did anybody ever see him with a gun? He OD'd? Any record of him having a wide assortment of pills? Because I don't believe he just started walking and waited for the onset of exposure.
And I will add that if he did go out in the desert to kill himself, my idea is that he would have chosen to shoot himself/OD/whatever very quickly. So, a search of the area done those weeks after his disappearance would have found him. Remember, there are no trees to hide him so he would be right out there in the desert and would be easy to see from the air if somebody was actually looking.
I know this may be trying to attach logic to the illogical but I am not of the opinion that every person who commits suicide is acting illogically. Most of the time, they think things out pretty thoroughly, including a suicide note. Sure, maybe Steven put some suicide plan together that would leave open the possibility that he was still alive because he would not want his parents to think he committed suicide. But, instead, just disappeared with no proof of life or death. It is possible.
i just think that the facts don't support that conclusion. The facts more support the idea of a guy who was desperate to find something new to do with his life, not somebody who was looking to end it. And that desperation took off in a direction that got him into trouble.
Actually the simplest theory is that he parked the car and went out and ended his own life.