When I was a child in India, I was taught (not by my parents, by the societal milieu I suppose) to not let the (soles of?) my feet touch a book or a bag that contains books of knowledge. In any case, the behavior is a strongly trained habit so I feel compelled to do it. I do not choose or or not choose to do it. It is close to an automatic behavior, something like wrinkling one’s nose at a bad smell or so on.

I was not brought up in a religious household and have never been a follower of any known religion. And I do not have any belief tied to this behavior. It is an oddity of my being that I accept.

Isn’t it interesting how one can be conditioned so? I sometimes wonder if alcoholics or drug addicts feel this way.

Perhaps the Japanese feel this way about their cultural quirk in the way I feel about mine.

Yes, I think that it's a good example where politeness and respect ingrained in society can be taken a step too far. I don't want my rescuers waste 30-45s on taking shoes off and after I had a stroke and minutes decide whether or not I ended up with a permanent brain damage...

These people will handle emergencies, but at a notch or two below fully equiped firefighters breaking the door and ready to deal with everything falling apart.

For instance for an elderly couple living together but both being pretty weak, if one's oxygen level was falling they probably couldn't get to the hospital for a full checkup by themselves. They'll call for help, these people will come, fit the patient with anything needed to safely make the trip, and move them out of the appartment to the nearest hospital.

There will be no need to trash the floor in precipitation, and they might spend some time in the appartement to properly access the situation and make it safe. They'll still want to be able to evacuate the person quickly if/when needed, but there will be a lot more to consider as well.