Periodic reminder that not all activism takes place online in casual and exposed places where you can observe and judge it. Before you decide someone isn't loud enough about a Thing, consider whether they've gone to ground to get the work done. Consider doing the same.
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Just because they are not grumbling constantly about one topic online doesn't mean they are not working their butt off to address something else more important to them.
There are a lot of problems in this world.