Because this industry is a knowledge-based industry, and it's a good idea in general to always be honing your skills and learning something new.
Even if you don't have any intentions of using a new language in your day to day career, there's usually a few super-interesting morsels in there that you can add to your knowledge banks.
I've personally lost count of the number of times I took a concept I learned in another language or technology stack and applied it to my day job.
If you think that complaining about a language on the internet is an effective way to hamstring wider adoption in and of itself... I've gotta say the results leave much to be desired.
Even if you don't have any intentions of using a new language in your day to day career, there's usually a few super-interesting morsels in there that you can add to your knowledge banks.
I've personally lost count of the number of times I took a concept I learned in another language or technology stack and applied it to my day job.