Why are there so many spoken/written/literary languages? It's essentially the same answer. People come at the same problem (describing operations to a computer/describing things to a person) independently and make it up as they go along. They don't converge because people have their own ideas about what's right and comfort zone.
It could be in the future that people will settle on a computer language. Musical notation, for instance, is fairly standardized now, but that was not always the case.
This is pretty much what I was going to say also.
1) Certain problem domains are better served via different dialects. There are problems for which Prolog-style languages are best and problems for which Algol-style languages are best. And there are many many problems best serviced by the style of one of the first high-level languages: LISP.
2) At their core, most of the languages decompose to the same core concepts such that I almost wish we would start referring to them as dialects instead of languages. At least for syntax, C, Python, Rust, Go have more in common than in opposition.
3) It's a good thing there are so many languages though it doesn't always seem that way day-to-day. It's a form of natural selection and evolution. Human progress is not linear. It's messy, has lots of false-starts, and backtracks often.
At least human languages are all there to solve the same basic problem. Computer languages usually are specialized for certain areas.
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