I have a feeling some of you do not know what redundant means. In the wet or any dry day, 2 cable operated brakes is better than 1. With a fixed gear bike you have a potential 4 brakes. Front, rear, chain and foot in tire. Almost every bike I know has a foot and a tire with at least one more brake. Anyone running a suicide setup is excluded.

Now if you want to run only one cable brake in the rain then make sure it's in good working order. If not, reconsider going in the rain. What part of this is hard for you guys to get past?