This USA vs. Canadian really gets old. Give it a rest. None of us knows what caused this accident, and while flying floats is a unique and special talent it does not relieve one from the most basic requiremeents. FWIW, the legacy airline I worked for had a minimum RVR 4000 for letting the F/O shoot an approach and I don't think it did much to enhance the safety. Pilots have struggled with ADF approaches since the Wright Brothers
ATP MES, COMM SES