It sounds absurd and to the opposition there will be ample opportunity to make it look "short sighted" etc etc.
The truth is a blind person has a right to defend himself as well. It would certainly be in close qtrs or useless and being blind can allow other senses to become enhanced.
I think it is really not an issue due to very few blind people will take advantage and until there is an instance where a blind person makes a decision with their lack of vision in regards to using lethal force with a firearm there is no data to examine.
Use caution when estimating handicapped peoples abilities!