It is "natural" for Japanese people. That is the culture.
There is a Japanese proverb, "Tatsu-tori atowo-nigosazu"（A bird that leaves a place does not leave it dirty.） It is an admonition that one who leaves should clean up the mess so that it is not unsightly. It also means that one's farewell should be beautiful.
Derived from waterfowl. Waterfowl are mainly found near the waters of ponds and lakes, and after living there to some extent, they fly away again to a different lake or pond. When they do so, the surface of the water is not muddy and is as beautiful as it was before, which is the origin of the phrase "a bird that stands still leaves no trace. This proverb is said to have originated from the fact that the surface of the water is clear and beautiful after the waterfowl has flown away. A dictionary written in the Azuchi-Momoyama period (1568-1600) describes the phrase as "tatsutori moatowo nigosanu," and it is assumed that the phrase was in use around 1600.
We learn "Dou-toku (morals)" from an early age. Therefore, we recognize that it is shameful to walk away from a place after making it dirty. We are strongly taught from childhood to clean up after ourselves.
So there is completely no intention to appeal to the world or to push people to "learn from the example and clean up".
Japanese people are embarrassed to walk away with a mess.
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