UK (and other non-US) protests are joining in on the bandwagon and as much to do with people being bored after months of lockdown as it does what's actually going on.
The Police here are nothing like the Police in the USA.
The US is five times the UK population but I believe its the case that the US Police kill more people in one year than the UK Police have ever killed in the past 150 years put together.
In 2018 the UK Police killed 3 people (all terrorists IIRC) while their US counterparts killed a thousand.