I'm not IFR, but isn't that why there are minimums? You can't see the runway at 400' or whatever that approach called for so you climb out missed and do what you need to do to go at it again or go somewhere else.
It looks like they were a little over a mile north of the airport - no runways aligned with the crash spot so they weren't straight in...hard to figure out what was going on there...maybe a case of the we missed but we need to get down so we're going to fly around low and try to get under this again for another shot...oh crap.
RIP. Definitely lessons to be learned...