They do NOT want justice; they want revenge. If Wilson somehow gets indicted, the trial will be a freak show with pre-planned riots. As in all capitulations, it makes it easier the second time and only makes for more demands.
This isn’t about the Wilson case (even though they really enjoy tormenting opponents). It’s to set up their next demand for grand jury “reform” that they have already starting carping about.
It also serves the purpose of reinforcing the “white man’s justice” meme and keeps the agitators’ names in the press.