Noticed this in my Latin-heavy neighborhood, and was wondering the same thing.

Curiously, the local black population seems refreshingly cynical and lax about all this folderol. While my direct experience is only anecdotal, the fact that the County's Covid messaging is heavily targeting them is telling.

My GUESS is that Latin societies had more of a class continuum, with some degree of social mobility and intermarriage at the margin. Black Americans, however, knew (or believed) their upward mobility stopped at the color line. So their potential payoff and incentives were much less. Over generations that would tend to create very different cultural attitudes towards compliance with authority.

On the other hand, this may amount to a "just-so story" -- one can come up with an equally plausible-sounding narrative as to why the opposite ought to be true.

Gentry liberals clearly believe that Latins are more tractable, whatever the reason; hence the drive to import them as a new replacement underclass. (And the over-compensating kayfabe of "Black Lives Matter" hysteria.)