It's not about if you have 'little chance' it's about if you have a chance at all - which you shouldn't. And the point is not about equivalence of deaths by police (there would definitely be more if the UK police were armed), it's about the way policing in the UK targets and perceives different races and the possibility of a climate that will allow what we see in the US to happen here.
In recent memory we have had entire police forces declared institutionally racist and, in addressing public safety, where police have clearly overreached their power and used unnecessary force against people of all colours, while there has been a woeful lack of accountability through the justice system.
There are parallels even from recent times with the killing of George Floyd
https://www.channel4.com/news/hearing-told-police-failed-in-duty-of-care-to-man-who-died
But it doesn't happen here:
Electrician Darren Cumberbatch was beaten with ‘excessive force’ by police
amp.theguardian.com
I refuse to draw the same anger about the destruction of property (which not many generations ago you were if you were black) or the burning of a flag, as that of a life. And as for dishonouring the cenotaph, what is the point in fighting Facism and intolerance if you are willing to accept it decades on?