I can't think of one legitimate reason not to have made a trip to Aruba, even if just to go to the site and see for myself. I'm not sure how much work he is doing, per his FB postings, he has been at the beach during the work week.
Under the circumstance, I can't see an employer not allowing an employee to take time off work.
Oh, and I'm not suggesting he should go to Aruba and remain there until this is resolved, but out of respect for Robyn I feel he should have already been to Aruba. It's not a big Island. No matter how little you know of it, it is easy enough to get around. Rent a car & get a map, take the bus or a cab.
If it were me, I agree, I would think I would definitely want to be there. I don't know him though, or his circumstances, anyone can post on FB from work.
I can recall, Natalee Holloway's friends getting unfairly attacked for not staying and searching for her, when in reality it was impossible for them to do so. It brought me back to that, that maybe there are legitimate reasons that he didn't go. I was just offering some other possibilities.
To be honest, I don't pay much attention to him or watch his interviews, we know what he's going to say and there's nothing much more he can add. After listening to him a few times I lost interest. But I don't think he has anything to do with Robyn's disappearance so for me he's easy to just disregard.