I am unsure of what makes us eventually die. Do some of us refuse stubbornly to pass and we end up living the life of the living dead?

I think as we age we regress to a child like state. The comforts are few. Popping one of them. I suspect that often the physical touch people receive when someone wipes their butt is the only physical contact they get.

We need to consider the monetary cost of healthy living. Yes, it is cheaper on the long run. However, for many folks it is a choice between the urgent and the important. It is not as easy to make yourself a salad when you worked 12 hours, commuted 2, and there is the choice between fast calories and more time in our feet.

I don’t think the current world is designed with the health of the population in mind. But yes, nothing can 100% prevent us from being impaired by accidents or illness, but as a professional ass wiper I can tell you that yes, what you do matters and significantly reduces your chances of having a stranger wiping your butt.
P.