I think it is because people react to the real biological fear of death engaging in any means they perceive will protect them from it. Excrement is the fundamental symbol of death as it screams we are only bodies and nothing more. Especially in an era of anti-religion, where science types claim there is no heaven. Bodies are buried in the earth to rot away with maggots and the where the shit goes. So it's fear of death of which TP is unconsciously associated.
So folks think toilet paper will keep clean and safe.
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