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Success doesn't necessarily mean you have other important things like impulse control, criticial thinking, or humility.
Then take the lack of those things and combine it with (likely) alcohol impairment and ego filled young men and you end up with a tragedy like this.
So many small steps lead to a young woman dying and these young men likely spending most if not all of their adult lives in jail.  Over what?  
A girl blowing you off when you approached her? Feeling embarassed? A petty argument?  
It's nonsensical.
Why do largely successful people do this? It's not like he was broke or something?