Then I suppose that with really bad visibility someone could probably fake an ILS and cause the plane to crash without the pilots having the chance to recover.

Then I suppose that with really bad visibility someone could probably fake an ILS and cause the plane to crash without the pilots having the chance to recover. After looking around, it seems that several large airports,.and even a few medium size airports in the US have Cat III approaches: https://sites.google.com/site/ilsapproaches/Home/cat3 https://sites.google.com/site/ilsapproaches/Home/cat3 I never even considered the possibility of a CAT IIIc where you can land in zero visibility, probably because I'll never fly an airplane with suitable equipment. I've never briefed flying a CAT III approach, and wouldn't even consider landing at those airports in the light planes that I fly. In my local area around KDEN the general consensus is that while it's technically legal to land a light plane at KDEN you would probably have to declare an emergency to get clearance from ATC, and even then they'd strongly encourage you to land somewhere nearby (like KFTG) if possible.