Why do people act like they don't know how to use a revolving door?

Why do people stop or slow down when going through a revolving door? They act like they don't know what to do. Do they realize that there are other people that are being affected by their actions? There are people stuck while they are trying to figure out how to walk through the revolving door. It's not that difficult people. Just keep pushing through!  And how about the dimwits that try and go through two at a time? Dummies!