Checking in here!
I suppose it is time for me to give my opinion too and I have to agree with those who say cull it. First off, let me say that I have 5 children with very tender hearts here and culling is never taken lightly at my house and that advice is not being given lightly. You really have to take a step back and look at the whole picture here. Comparing a chicks life to a humans is just absurd. No, don't start throwing stones at me just yet because I do have good reasoning behind that statement.
I just hatched a group of 40 chicks about 2 1/2 weeks ago. One chick came out to where it couldn't stand, something just wasn't right with it's joints or legs. We did everything we could and gave it several days to see if it would, or even could, have a chance. Well, being the underdog that it was, the rest of the chicks attacked it, I mean literally ATTACKED it, when I put it in the brooder. They kept pecking at it and would grab it's toes and start dragging it. What kind of life was that little chick going to have and what would have been my purpose in leaving it to be killed by the other chicks? Could I have put it in a separate brooder and let it hang on as long as it could? Sure I could of and we actually tried it, however, it just cried and cried. I finally convinced myself amongst 3 sobbing children that I had to cull it. I was not going to let it suffer, out of loneliness or being beat to death by it's brooder mates. Now step back for a moment and ask yourself how "humane" those last two options would have been? Mind you, I had three sobbing children at this point to and mommy's are suppose to fix things. It hurt my heart to have my kids hurt too, but I had to do what was in the best interest for that little chick and not what us humans wanted.
Now back to the blind chick. Have you ever sat and watched a group of chicks in a brooder? They run around watching the others and always, always, always peck at each other, right? Well, if this little chick cannot see to get out of the way or know which way to go in to get out of the way, how do you think it's going to survive with the others trampling it and pecking at it? Anyone who's raised chicks knows this will happen. Now ask yourselves exactly how humane it would be for that little chick to end up with that type of treatment? Next try and consider it finding its water and food supply. Could the OP hand feed it? Sure she could, but chicks eat and drink ALL of the time and I don't know about any of you, but there would be absolutely NO WAY my busy schedule (I'm even a full time at home mom) would permit me to sit all day long and hand feed this chick. NO WAY!
Now all feelings aside and with the proper picture painted, ask yourselves what would be the most humane thing to do here. I think most everyone will agree that it would be best to cull. That is part of raising chicks and part of farm life. It's the part that stinks but it is what it is.
To the OP - Culling doesn't have to be disgusting and if you would like a humane, non-disgusting way to help this chick, feel free to PM me.