so they can forfeit all the games they want, it (probably) won't be enough by itself to change the US's white supremacist police state.

but I assume they know that and it's not really their goal.

It was something they could do. And something that AFAIK, had never been done in domestic US sports.

It's about gestures, politics, symbolism, and making your voice heard, even if racist cops and their paramilitary white supremacist buddies are going to keep ignoring you until we all take their power away.