There is one advantage for the forces of sanity in what you describe: there is no statute of limitations on criminal homicide.

The players who control the system directly are all elected. It takes a long time to nail an elected official--particularly over one decision---and it gets harder with time. But it's not impossible.

Also, if you could arrange an electoral near-death experience, that might get you as far as charges filed. You have to define that as a victory unless you want to fiddle with everybody's right to a jury trial.

Getting the charges filed is a hard job of short term organizing. Creating a social atmosphere where an unbiased jury will be readily available in a case where "race" is an issue is a harder job on which the label "organizing" does not fit. It's "education" and it's generational.