We knew something was funny with the bug-eyed bride because the groom wasn't that upset. That's why we thought he killed her.
Following your logic of "upset", it's interesting to note that Joran wasn't "upset" with Natalee's disappearance. He never expressed his regret or concern that the girl was missing to her parents. A decent, innocent person would have expressed shock or grief that the girl he was last seen was missing. Instead, he was on the defensive.
IOW's "it's not what they say...it's what they don't say" is an easy way to judge people.
sw