From what I understand BLM in the US is a separate organisation with different objectives to its counterpart in Britain.
The US has a direct link with the slave trade and imposed a regime of segregation up until the late 60s. The country is still suffering the consequence of those laws and depth of feeling much stronger.
In that sense I think its difficult for us to judge and it would be wrong for us to apply our values. Because of that, it may be reasonable to postpone games over there but certainly not here - I cant see how it would come to that anyway.