Whether it's icing beyond the airplane's capabilities as in the link or visibility beyond the pilot's capabilities as apparently happened in this crash, there are times when the decision to retreat has to be made immediately. Any of us who have flown for any length of time have experienced one or the other or both of those situations.
I remember some 40 years ago when I was working on my commercial, another couple, Wife 1, and I were flying from Laramie to Newcastle, WY, in a 172. A rather benign looking rain cloud was above our path with what appeared to be light rain falling. The man asked me what happens if an airplane flies through rain, and I quipped, "It gets wet." Rather than divert around the rain, I elected to show him that it was no big deal. Only, I had never flown through rain before.
From a distance, we could see through the rain. But as soon as it started hitting the windshield, all of a sudden visibility dropped to next to nothing. Good lesson for me. Since that time, I've flown through countless rain and snow showers (mostly while flying IFR), knowing that I'll lose visibility, but also not being in a situation like Mr. Wilson undoubtedly found himself, with rocks on either side and not enough visibility to navigate between them.
Be careful out there.
Cary