Demanding that all shoes come off is an American "airport security" pet project -- taking off shoes as part of the "airport security" process is anything but universally associated with airport security.

In any event, glad to hear that some people try to clean some bins sometimes.

Thankfully, there's the option of sticking your stuff inside a plastic (or washable) bag before putting it in the bins.

I'd be surprised if the amount of fecal matter that ends up in traveller's bodies in the US hasn't increased due to the shoe carnival. Taking off shoes and putting them back on and then eating prior to cleaning the hands is a recipe for consuming that. The nasty shoe carnival is another reminder to wash your hands properly with soap and warm water for approximately 20 seconds prior to eating -- just don't count on the FAs who serve you necessarily doing the same.