This is a valid concern.

How about this. Let's say you bring an extra tube on a long solo ride, and during that ride, due to an unfortunate event, you get a flat and use the spare tube. Then, about eight walkable miles from home, you flat again. Now you've got no choice but to walk eight miles in shoes designed not to be walked in. On a nice sunny day, that's not as much concern as a blustery day threatening rain, or in an area that might not be safe for a woman walking alone, particularly a "handicapped" woman.

It's a risk we take, but, ask yourself this: would you let your teenaged daughter ride with those shoes, in your area?