One thing you might be coloring your perception, is the lack of visibility into other actions. Just because a person posts #blm and it’s largely a symbolic gesture and doesn’t have a big impact, doesn’t mean they didn’t take other more tangible steps - donations, calling their representatives, boycotts, etc. but you wouldn’t know about those. So every time you see the gesture you see inaction, when sometimes the gesture is just the tip of an iceberg of dedicated action.