DA Trying To Bring Charges In Cop Involved Shooting

From the LVRJ:
Clark County District Attorney Steve Wolfson will seek an indictment against Las Vegas police officer Jesus Arevalo in the controversial fatal shooting of Stanley Gibson.
The Review-Journal has learned that a grand jury is expected to begin hearing testimony in the case next week. More than a dozen witnesses are likely to testify, meaning it could take weeks or even months for prosecutors to present their case. Grand juries are closed to the public.
The action could result in the first indictment against a Las Vegas police officer for an on-duty shooting in at least 20 years, if not the first ever. Wolfson, through an assistant, declined comment.
Sheriff Doug Gillespie did not respond to requests for comment late Monday. In a video sent to all 5,600 department employees last week, Gillespie said he expects Wolfson to take the case to the grand jury, but said he does not believe the shooting rises to a "criminal matter," according to several people who have seen the video.  http://www.lvrj.com/news/da-will-seek-indictment-of-metro-officer-who-killed-disabled-veteran-173224211.html
Wolfson is a liberal District Attorney, appointed by Democrats and he has been pressured by the public and media to indict any cop in a police shooting.
This case was an accident in which the victim started the process of police intervention.  It's a shame that he died but the case doesn't rise up to a criminal case.
The Trevon Cole shooting was far more egregious than this one and the shooter in that case was never brought up on charges.
So, why is Wolfson doing this now?