You're right. Why do their customers insist on working the same hours they do? You'd think they'd work different hours so they could run their errands when things are open.

No one presumes you 'should' work 9-5, but that is the way it is, and the bank/postal office/whatever employees don't have the option to work evenings. It is the way it is.

Now whether we could have a better system -- Sure! I'm all for a better society. I'm just saying it's not the way it is because of discrimination or some other conspiracy.