We are not talking about a 747, its an F100. And what was said before is that conditions were CAVOK at numerous sites around Paraburdoo. So the options for diversion should have been high, facilities mean little in this regard. If it was the case of CAVOK at Newman for instance, why did they not divert there after one or two approaches, there was no mention of a fuel emergency being declared in the report, or any emergency being declared before descending below minima. I'm not debating they should have fumbled to another airport not knowing what the weather was. There's an AWIS at YPBO, they should have discussed options when they received the bad news on that before the first approach, they could have easily requested weather on an alternate at that point, maybe they did, we don't know yet.
The question is, why did the make 4 attempts and bust a minima?