It’s a very good relevant XKCD.

The title text is more directly applicable: If you ask “why are leaves green?” the usual answer is “because they’re full of chlorophyll, and chlorophyll is green,” even though “why does chlorophyll scatter green light?” is a great question too.

Sometimes I think it was a mistake to let the programs we primarily use to view text and images become bloated virtual machines that execute megabytes of arbitrary code with every page load.