The BLM movement was protesting something that had been ongoing for decades, and had finally become absolutely undeniable with grisly film footage, but there was still nothing being done. That made it ripe for people around the world to demand change.
I sure wish the entire would would be doing something similar now, to isolate Russia. There's an unfortunate symmetry that people expect the US government to improve, while they treat more dictatorial governments as "eh, they won't change, so why bother"? The US has absolutely made itself look awful by failing to respond to a long and increasingly well-documented history of police abuses -- as well as invasions -- but people protest because they expect it to do better.
Other countries are responding to the Russian invasion, and it seems like people are using that in place of letting their personal views be known.