Public transport is the real killer for me. It seems bizarre to me now that there was a time I could stand on a bus or train and comfortably just hold the support handrail with a bare hand and not wash it afterwards or anything. These days I avoid them at all costs and still gotta carry disinfectant for mental health purposes.
You’re right. Going down through the levels of “okay, and why?” works on a theoretical level but requires both the person asking the right why-question and a level of intellectual honesty from both parties that is incredibly hard to find.
It’s not a bad approach for questioning your own beliefs though, if you can muster the strength to be honest with yourself.