Handicapped shopping

Now I know this sounds cruel and unusual, but one day when I was passing a shop that sells sofas and chairs, I spotted a communal wheelchair parked on the inside next to the door. This raises two questions to my mind.

1) Why wouldn't they bring their own if they needed one?

2) What the hell does someone who's numb from the waist down need a chair for anyway? Surely if you can't feel it then there's no need for cushioning or anything like that.