I think this article from Trevor Phillips is good in explaining what this is about
www.thetimes.co.uk/article/culture-warriors-want-control-not-equality-56knrgklh
Culture warriors want control, not equality
Whether it’s on race or gender, the extremists in our midst want to stop freedom of speech
The heart of liberalism is about finding a balance between opposing views and things working because the balance between the extremes isn't tolerated by public consensus. This requires full inclusiveness and representation. It stops people from missing their 'political blindspots' by allowing free speech. Liberalism is supposed to protect the weakest in its society this way.
Where it has failed is in its ability to identify those most in need of that protection - particularly BAME needs and the issue of poverty.
This is because the 'liberal consensus' has been hijacked by middle class privilege so it has become unrepresentative of wider concerns within society. This is primarily within the media and within government but extends to other controlling organisations and is why regulatory capture occurs.
The post war settlement which established modern day liberalism really started to collapse in around 2008 and the financial crisis) but has its roots further back than that. The 50s, 60s, 70s and 80s were a time of social mobility where there were opportunities to move up the ladder and to not be restricted by the accident of your birth.
What started to happen after this was a reduction in things like apprenticeships and investment in people in the same way. If you didn't have an education you couldn't progress in the same way. Experience on the job became less valued. This closed many doors to people and instead you had an increasing number of already affluent middle classes dominating and returning us to a society which is structured more like pre-world wars in terms. This process accelerated post 2008 and it also created a generation of younger people who felt both very excluded because of their privileged educated and because even though they had it, they couldn't do anything with it as there is a lack of opportunities. They lack purpose. They were above menial jobs and had no idea if experience of life and yet their were few opportunities in the middle management / establishment they had been trained to replace their parents and grandparents in. Meanwhile you have an invisible layer of society below that which isn't getting listened to and is disconnected to the lives of the middle class do gooders trying to find a space in society.
Enter the young woke. A class if younger people determined to right the wrongs of their parents generations without much of a clue of what those failings are because of a lack of life experience. There is a new to find causes to celebrate and champion but little understanding of the underlying issues. Instead it's driven by consumers idealism and crowd identity. Hello identity politics.
Those with genuine grievances become indisguishable from those who are hijacking this need for purpose. And these middle class young are struggling to identify legitimate ones from those piggybacking onto those with a cause because of their lack of understanding of the world and their privilege.
Our 'do-gooders' end resembling victorian moral guardians with a hugely authoritarian streak of puritanical ideals which must not be discussed or debated. That's a far cry from the post war situation where those who have fought in the trenches in WW1 and WW2 who had more basic demands of access to health care. Other modern victorian are all about 'keeping up appearances' rather than the lived experiences.
The virtue signaling isnt to the black community (or which other cause it is) its to 'other people like me' to prove worth and status as evangelicals trying to establish a new world order. That's about maintaining positions of power within the middle class at a time its shrinking and its inherited wealth rather than earned opportunity are now dominating.
There are white middle class people who definitely do support BLM but there are also many who are using it as an opportunity for self preservation and advancement of their own position and lack any real true understanding of the problem because its routed in socioeconomic barriers created by the middle class dominance.
This is where the parallels of middle class transallies fit in.
It's all about economics and a shift from opportunity of the masses to a society once again controlled by an elite and a smaller middle class where conformity and appearances dominate over reason, talent, ability and hard work.