This is entirely my own opinion. We should be very clear on what we mean when we're discussing "Rust" in this thread, as I think people are confusing Rust the language and the project around it.
Rust the programming language is a piece of software you can download, disconnect yourself from the world at large and continue to use and modify on your computer.
The Rust project is a real world community and organisation of people that works on building new versions and provides support. Which is done mostly by volunteers and a lot of whom are people who are underrepresented in tech. This organisation of volunteers has the agency to try to build the type of community it wants to be a part of and participate in. Since the very start the Rust project has had a Code Of Conduct which states the following in the very first line.
We are committed to providing a friendly, safe and welcoming environment for all
This is an inherently political statement when we live in a world where there has been significant systemic injustice against people of colour and queer folk, both in tech and in the world at large. Working towards providing a welcoming environment for all requires an active voice to push back.
I resent the argument that somehow racial justice is an US issue. As if most country's histories aren't marred with racial violence and injustice, and that somehow racism doesn't continue to be a problem in those countries today.
The Rust Twitter account is run by the Rust core team, it's their decision to decide what content should be on it. I don't think the agency or language of what to post on social media should be decided by the community. If you don't want to see it, you can always just unfollow them.