Once positive thing could come out of this. Perhaps a crime this tragic and so highly publicized is enough to affect change in the RTP. It seems as though this shooting can be traced to police mismanagement, or better yet corruption because they wanted to keep the perpetrator's name out of the news when he caused trouble while a member of the RTP.
One thing that would help is if the media did not continuously publish pictures of the shooter. It makes bad people famous. This I think invites copy cat actions. In America some shooters make videos before they commit their acts so they can be shown on social media. The media in the US constantly flashes pictures of the shooters again and again on the 24 hour news cycle. They even seem to keep a tally of who has shot the most people. To me this just entices other unstable people to shoot for the record (no pun intended this is very serious).
These shootings are quite often committed by people with suicidal tendencies who want to take other innocent people with them when they die. For want of a better term, a suicide party of sorts. Check how many times this pattern has occurred in the US in recent years.