How about a little substitution? Let us just say this aircraft had carb icing or an ignition switch failure. Would these have been to responsible for the crash? In this case, I feel each would have lead to the same outcome. That therefore means we should elsewhere for a solution - ie. an attempt to prevent reoccurence.
That doen't mean to say we should do all we can to prevent the wrong fuel from getting in the tanks. What we must do is invest in training to ensure engine failures in singles are more surviable than they are at the moment.
PM