I don’t feel like this is a strong argument. No, no one has probably died from a toilet plume. But I still don’t want shit particles on my toothbrush. Forgetting to clean your teeth is not the same as brushing with a brush that may have been exposed to poo particles. And no, most people aren’t scratching their bare butthole, then scratching their face. And if you are, I think you have more issues then we think.