Shops and stores want to open because they know they have customers. Obviously night-time hours are more in demand in cities. That's all there is to it. People like to say something but do something else...

If 23%+ of people end up shopping during those time periods (since 77% say they don't outside Paris) then that's more than enough do say that people want longer opening hours.

Personally I think that shops open 7 days a week is very useful.

Let the market decides. The legal restrictions are paternalistic.