The GJ might very well be pressured into an indictment and the resulting trial would be such an open and shut acquittal that the resulting violence will be worse. Or a trial judge could exclude all exculpating evidence and be left with the first “testimony” to reporters of street thugs who were trying to dramatize a fantasy.
Is it possible that the Grand Jury might not indict because has a matter of fact, that the officer is not guilty.