I'll take a stab at it.
There seems to be this strange desire by some to disassociate Black Lives Matter the organization from BLM the social movement, and use this to ignore the very real problems that one could (and I would say
should ) have with that organization. Almost as if the organization itself is some distraction technique to avoid dealing with racism. But it's not. Black Lives Matter an organization, not a movement, and you know how I know?
Because it started in 2013, not 2020.
BLM was started as a response to the shooting of Trayvon Martin by George Zimmerman, who was NOT a police officer, and also is Hispanic. It was NOT to protest police brutality. It was NOT to protest the history of discrimination. It was an expression of outrage, because America was not sufficiently outraged at this random kid being shot by this random asshole, and supposedly this was proof of widespread white supremacism.
It was a straight-up accusation to white America of simply not caring about black people. That's why the slogan itself is so divisive: when you shout "black lives matter!" at someone, demanding their agreement, you're not simply raising awareness or making a plea for help; you're instead accusing that person of being racist until they prove otherwise to your personal satisfaction. That's the reason why, at first, the hashtag response was All Lives Matter, because it was an attempt to diffuse that accusation, but naturally, it was treated as some sort of white supremacist dog whistle, because bone-headed arguments where neither side understands the other is all that American politics is capable of producing.
From that point, an organization was formed, comprised of mostly racist ideologues who know nothing about history, dedicated to bring about an end to white supremacism, which naturally they claim is embedded into the fabric of western society, because white people are inherently racist etc. (yes, the irony forever eludes them). The overthrow of capitalism and democracy, both of which they imagine were created to cement white oppression of non-whites, is their proposed final solution to the disease of whiteness which supposedly plagues the globe. They are not shy about any of this, and yes they celebrate the fact that they are "cultural Marxists", and no I am not exaggerating.
The reason why most believe it is a movement, however, is because following the mass outrage to George Floyd's death, the organization saw a golden opportunity to thrust themselves into the centre of the conversation, and become the face of the protest/outrage. That's also why all the same problems contained in their message and their slogan were writ large across the face of the culture war. The sentiment behind the protests was never really reflective of the sentiments of the BLM organization, but because they successfully made their slogan the vanguard of the 'cause', the waters have become sufficiently muddy for it to no longer matter.
If the 'movement' doesn't want to be tarred with all the criticisms of the organization, then there is a simple yet effective solution:
change the bloody name. Maybe something more inclusive, like I dunno All Lives Matter? And if you can't stomach such an admission that the other team were actually right all along, then how about something like: Discrimination Needs To End?
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As for the kneeling, well, it doesn't bother me, it just doesn't overly impress me either. I respect the players and their right to express themselves, and I can, as others here suggest, simply wait 10 seconds and then my life continues without missing a beat, especially since they're doing it of their own volition, and not being shoved out there as a PR stunt to make the Premier League look good on Twitter.
Booing that gesture is indeed an expression of free speech, but so is condemning the boos, so that topic is moot to me, but it does have to be said: if you open up an encyclopedia and turn to the "Football Fans Most Likely To Do Racist Things" section, Millwall have a whole page to themselves.
Sometimes a spade is a spade, even though we should be careful not to judge too quickly in most cases.