Paula, mules are very stylish shoes. I'm really glad there is nothing more pressing in your life than a need to complain about someone wearing shoes to a job in an air conditioned building, where they are doing some type of work that benefits someone, somewhere.
...then it's obvious you have never been in an earthquake....
I was in the Loma Prieta (SF) earthquake in SF in 1989 and the Nisqually (Seattle) quake in 2001.
I will NEVER wear shoes to work in which I can't
1) run somewhat decently 2) climb down 20+ flights of stairs without holding up everyone coming behind me
I would think after 9/11 women would have more sense.