It also seems quite dangerous to take them off- depending on the home. Some hoarders, drug addicted situations have needles, glass shards and razor blades in the debris on the floor. How do they handle hoarders in japan?

Probably the same in most Western countries. It's self reinforcing though; if you were expecting to take them off you'd never pick those shoes by default, rather leave them in the back of the car (which presumably/hopefully is what they do in Japan, in case they *do* need them? idk…)