Why do you need to wash your hands when you go to the toilet?

In ancient times, the toilet had to be washed, there was no toilet paper, everything was a tradition left over from ancient times, what washed hands before meals, rinsed after meals, and washed hands after entering the toilet, all of them were a hygiene, which looked more hygienic. For example, people who love cleanliness go out and wear leather shoes.

There is no connection between traditional habits and harms Take hand washing as an example, if we let the Marxist "truth from facts" say, if it is dirty, it must be washed, and if it is not dirty, there is no need to wash, it depends on the situation. Because only you know whether it's clean or not, but let it be seen that if you don't wash your hands, he won't be able to eat, and at most he will affect his appetite, and he will think that you are not a good tutor. I've never seen a stomachache after eating, right...