the interesting question is...if he was married to a different kind of person would he have murdered? IMO, eventually Scott would feel trapped being married to any woman, freedom seemingly his goal after a few years of marriage.
And his having to present a perfect image to the world have precluded a divorce in any marriage, JMO.
Something influencing my personal opinion are the two missing women in the general vicinity of Scott when they disappeared.
Those incidents of girls missing when he was in college is a "mystery" isn't it? Remember how he SUDDENLY left Arizona. He had been called in for an interview but never went in. Perhaps, with Laci, he thought he was proficient enough to pull it off. I doubt he banked on the fact the whole City LOVED Laci.