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There is a loud group of developers that want to get rid of C, because of it's lack of memory safety, and all the security issues that come with that. Also, there is still love for Mozilla, despite some of their annoying behavior lately.

I don't think Rust is being promoted more than any other language people feel passionate about, but these things tend to go in clusters, so it may seem that way. I think if something specific to a language makes it to the front page, the discussion leads people into looking up things about that language, which then makes them discover, or remember something they think is worth sharing and repeat. The last few weeks I've noticed more Ruby than usual, I see clusters of Python and Go very often, and every year or so there are a few lisp stories in a row. Sometimes this also coincides with conferences.

You don't generally see stuff advocating for bigger languages because they don't need advocates. Instead you might see particular libraries or techniques. I suspect the hype around Rust specifically is people that really like rust hoping that it catches on before it dies out like so many other technologies.