they come into existance from other languages that get distorted beyond recognition by the people who misuse them
“Misuse” is an inappropriate word to employ here. The correct way to speak a language is the way that others speak the language, so that you are mutually intelligible. Changes to how language is used aren’t a deviation from the “correct way” for exactly the reasons you’ve pointed out: language is not prescribed.
That’s all well and good, but I maintain my position both with regard to the previous commenter and – though I hadn’t meant to address it at the time – also to Esperanto. If uptake of the language is sufficient, it will devolve into dialects and further, in spite of the intentions of its inventors.