Some of the mentioned sidewalks are one hundred years old, and are thoroughly decayed as a result. I bet if every road you had to drive on was in that condition then you'd be upset about it and would demand repairs, rather than just throwing up your hands at the inevitability of entropy. Maybe you want to go live out in primitive conditions in the jungle somewhere, but the rest of us want civilization. Your logic applies equally to roads as it does to sidewalks, so should we just give up on them as well?