What concerns me is that nowadays the majority of people aren't racist at all - you, your friends, probably your families and they're all shocked and appalled by what's recently happened, but the people who are deeply racist, the ones who are a danger, are not going to change their minds because people are saying en masse that it's not ok.
One thing that I have learned is that racism does not just consist of overt in-your-face violent discrimination. It's also entrenched micro-agressions that many people would never dream of 'counting' as being racist. And when you challenge them on this they often become very uncomfortable and defensive because they don't consider themselves to be racist.
A few years ago I worked near a city centre. At lunchtime it was quite common for a group of us to go out for lunch or for a quick trip round the shops. One of my colleagues in this group was black. One day her and I went into a department store to have a browse. She went to one side of the floor and I went to the other. We were both in formal business suits. Guess which one of us got tailed all the way round by a security guard - who wasn't even trying to be discreet? I was shocked at how matter of fact she was about it - not angry or embarrassed, just resigned to it. She thought it was funny that I was so naive. That was a wake-up call for me.
I have another friend who is married to a Mexican-American woman. They live in a very white area of the US. At social gatherings with the children, she always introduces herself as 'X and Y's Mom' because if she doesn't, then they assume that she's the nanny - simply because she's brown and her children do not look mixed race.
Look at the way two CNN journalists were treated - the black journalist was arrested live on air! The white journalist was allowed to carry on filming.
I am no fan of the trans-activist Munroe Bergdorf, but IMO her original statement about racism was bang-on. As a white woman it makes me uncomfortable because my default position is that I am not racist. I don't discriminate against people because of the colour of their skin. But it goes deeper than that. Being an ally also means recognising your position of privilege. And supporting the conversation without centring it on your experiences and everything that you are personally doing - which is why I am not a fan of the take the knee selfies that white people are posting from their own homes. As PP have explained - to do so as an ally and part of a wider street protest, or in solidarity with POC on your sports team at a public event - that's different because it is a powerful political statement. But a white woman in Stoke-On-Trent doing it in her living room and sticking it on FB just feels like attention seeking for all the wrong reasons.