I don't know if they were "very good people", but I haven't heard any reason to think otherwise.
And your own source makes it clear that the government wasn't intimidated by these peaceful protests:
> lawmakers were meeting to debate an end to the emergency order... Despite the pressure, Whitmer extended the order, which was due to expire at the end of Thursday.
Do you think 20 or 30 armed Black men could have gotten away with this?
https://www.gannett-cdn.com/presto/2020/05/05/PDTF/5969fca5-...
I'll just say that if 20 armed black men couldn't get away with protesting in Michigan, that says something very bad about the Democrats who run the state.
But those policemen probably weren’t wearing Black Lives Matter under their uniforms.....